{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47300", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T13:27:52.132Z", "datePublished": "2024-05-21T14:35:22.040Z", "dateUpdated": "2026-05-11T13:51:49.342Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:51:49.342Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\n\nDuring testing of f263a81451c1 (\"bpf: Track subprog poke descriptors correctly\nand fix use-after-free\") under various failure conditions, for example, when\njit_subprogs() fails and tries to clean up the program to be run under the\ninterpreter, we ran into the following freeze:\n\n [...]\n #127/8 tailcall_bpf2bpf_3:FAIL\n [...]\n [ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\n [ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\n [ 92.043707]\n [ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87\n [ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\n [ 92.046785] Call Trace:\n [ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.049019] ? ktime_get+0x117/0x130\n [...] // few hundred [similar] lines more\n [ 92.659025] ? ktime_get+0x117/0x130\n [ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.662378] ? print_usage_bug+0x50/0x50\n [ 92.663221] ? print_usage_bug+0x50/0x50\n [ 92.664077] ? bpf_ksym_find+0x9c/0xe0\n [ 92.664887] ? ktime_get+0x117/0x130\n [ 92.665624] ? kernel_text_address+0xf5/0x100\n [ 92.666529] ? __kernel_text_address+0xe/0x30\n [ 92.667725] ? unwind_get_return_address+0x2f/0x50\n [ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.670185] ? ktime_get+0x117/0x130\n [ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.675159] ? ktime_get+0x117/0x130\n [ 92.677074] ? lock_is_held_type+0xd5/0x130\n [ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.680046] ? ktime_get+0x117/0x130\n [ 92.681285] ? __bpf_prog_run32+0x6b/0x90\n [ 92.682601] ? __bpf_prog_run64+0x90/0x90\n [ 92.683636] ? lock_downgrade+0x370/0x370\n [ 92.684647] ? mark_held_locks+0x44/0x90\n [ 92.685652] ? ktime_get+0x117/0x130\n [ 92.686752] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.688004] ? ktime_get+0x117/0x130\n [ 92.688573] ? __cant_migrate+0x2b/0x80\n [ 92.689192] ? bpf_test_run+0x2f4/0x510\n [ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0\n [ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90\n [ 92.691506] ? __kasan_slab_alloc+0x61/0x80\n [ 92.692128] ? eth_type_trans+0x128/0x240\n [ 92.692737] ? __build_skb+0x46/0x50\n [ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50\n [ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\n [ 92.694639] ? __fget_light+0xa1/0x100\n [ 92.695162] ? bpf_prog_inc+0x23/0x30\n [ 92.695685] ? __sys_bpf+0xb40/0x2c80\n [ 92.696324] ? bpf_link_get_from_fd+0x90/0x90\n [ 92.697150] ? mark_held_locks+0x24/0x90\n [ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220\n [ 92.699045] ? finish_task_switch+0xe6/0x370\n [ 92.700072] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.701233] ? finish_task_switch+0x11d/0x370\n [ 92.702264] ? __switch_to+0x2c0/0x740\n [ 92.703148] ? mark_held_locks+0x24/0x90\n [ 92.704155] ? __x64_sys_bpf+0x45/0x50\n [ 92.705146] ? do_syscall_64+0x35/0x80\n [ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae\n [...]\n\nTurns out that the program rejection from e411901c0b77 (\"bpf: allow for tailcalls\nin BPF subprograms for x64 JIT\") is buggy since env->prog->aux->tail_call_reachable\nis never true. Commit ebf7d1f508a7 (\"bpf, x64: rework pro/epilogue and tailcall\nhandling in JIT\") added a tracker into check_max_stack_depth() which propagates\nthe tail_call_reachable condition throughout the subprograms. This info is then\nassigned to the subprogram's \n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "39f1735c8107ef43a53c4daf82f330d880488d8f", "status": "affected", "versionType": "git"}, {"version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "cbb086074dab631ac43f8645cbac1d7b148e05c4", "status": "affected", "versionType": "git"}, {"version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "5dd0a6b8582ffbfa88351949d50eccd5b6694ade", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.54", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13.6", "lessThanOrEqual": "5.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.10.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.13.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f"}, {"url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4"}, {"url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade"}], "title": "bpf: Fix tail_call_reachable rejection for interpreter when jit failed", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-07-24T17:11:18.549517Z", "id": "CVE-2021-47300", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-24T17:11:23.015Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.540Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.540Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47300", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-07-24T17:11:18.549517Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:13:52.358Z"}}], "cna": {"title": "bpf: Fix tail_call_reachable rejection for interpreter when jit failed", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "39f1735c8107ef43a53c4daf82f330d880488d8f", "versionType": "git"}, {"status": "affected", "version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "cbb086074dab631ac43f8645cbac1d7b148e05c4", "versionType": "git"}, {"status": "affected", "version": "ebf7d1f508a73871acf3b2bfbfa1323a477acdb3", "lessThan": "5dd0a6b8582ffbfa88351949d50eccd5b6694ade", "versionType": "git"}], "programFiles": ["kernel/bpf/verifier.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.54", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.13.6", "versionType": "semver", "lessThanOrEqual": "5.13.*"}, {"status": "unaffected", "version": "5.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/bpf/verifier.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f"}, {"url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4"}, {"url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\n\nDuring testing of f263a81451c1 (\"bpf: Track subprog poke descriptors correctly\nand fix use-after-free\") under various failure conditions, for example, when\njit_subprogs() fails and tries to clean up the program to be run under the\ninterpreter, we ran into the following freeze:\n\n [...]\n #127/8 tailcall_bpf2bpf_3:FAIL\n [...]\n [ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\n [ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\n [ 92.043707]\n [ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87\n [ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\n [ 92.046785] Call Trace:\n [ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.049019] ? ktime_get+0x117/0x130\n [...] // few hundred [similar] lines more\n [ 92.659025] ? ktime_get+0x117/0x130\n [ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.662378] ? print_usage_bug+0x50/0x50\n [ 92.663221] ? print_usage_bug+0x50/0x50\n [ 92.664077] ? bpf_ksym_find+0x9c/0xe0\n [ 92.664887] ? ktime_get+0x117/0x130\n [ 92.665624] ? kernel_text_address+0xf5/0x100\n [ 92.666529] ? __kernel_text_address+0xe/0x30\n [ 92.667725] ? unwind_get_return_address+0x2f/0x50\n [ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.670185] ? ktime_get+0x117/0x130\n [ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.675159] ? ktime_get+0x117/0x130\n [ 92.677074] ? lock_is_held_type+0xd5/0x130\n [ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.680046] ? ktime_get+0x117/0x130\n [ 92.681285] ? __bpf_prog_run32+0x6b/0x90\n [ 92.682601] ? __bpf_prog_run64+0x90/0x90\n [ 92.683636] ? lock_downgrade+0x370/0x370\n [ 92.684647] ? mark_held_locks+0x44/0x90\n [ 92.685652] ? ktime_get+0x117/0x130\n [ 92.686752] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.688004] ? ktime_get+0x117/0x130\n [ 92.688573] ? __cant_migrate+0x2b/0x80\n [ 92.689192] ? bpf_test_run+0x2f4/0x510\n [ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0\n [ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90\n [ 92.691506] ? __kasan_slab_alloc+0x61/0x80\n [ 92.692128] ? eth_type_trans+0x128/0x240\n [ 92.692737] ? __build_skb+0x46/0x50\n [ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50\n [ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\n [ 92.694639] ? __fget_light+0xa1/0x100\n [ 92.695162] ? bpf_prog_inc+0x23/0x30\n [ 92.695685] ? __sys_bpf+0xb40/0x2c80\n [ 92.696324] ? bpf_link_get_from_fd+0x90/0x90\n [ 92.697150] ? mark_held_locks+0x24/0x90\n [ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220\n [ 92.699045] ? finish_task_switch+0xe6/0x370\n [ 92.700072] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.701233] ? finish_task_switch+0x11d/0x370\n [ 92.702264] ? __switch_to+0x2c0/0x740\n [ 92.703148] ? mark_held_locks+0x24/0x90\n [ 92.704155] ? __x64_sys_bpf+0x45/0x50\n [ 92.705146] ? do_syscall_64+0x35/0x80\n [ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae\n [...]\n\nTurns out that the program rejection from e411901c0b77 (\"bpf: allow for tailcalls\nin BPF subprograms for x64 JIT\") is buggy since env->prog->aux->tail_call_reachable\nis never true. Commit ebf7d1f508a7 (\"bpf, x64: rework pro/epilogue and tailcall\nhandling in JIT\") added a tracker into check_max_stack_depth() which propagates\nthe tail_call_reachable condition throughout the subprograms. This info is then\nassigned to the subprogram's \n---truncated---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.54", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13.6", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:51:49.342Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47300", "state": "PUBLISHED", "dateUpdated": "2026-05-11T13:51:49.342Z", "dateReserved": "2024-05-21T13:27:52.132Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T14:35:22.040Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C9B526EA-4055-43C8-9B30-7E7067C9E43C", "versionEndExcluding": "5.10.54", "versionStartIncluding": "5.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "512C22FC-1524-4E6F-9E62-4F4B7B6E0576", "versionEndExcluding": "5.13.6", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*", "matchCriteriaId": "71268287-21A8-4488-AA4F-23C473153131", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "23B9E5C6-FAB5-4A02-9E39-27C8787B0991", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\n\nDuring testing of f263a81451c1 (\"bpf: Track subprog poke descriptors correctly\nand fix use-after-free\") under various failure conditions, for example, when\njit_subprogs() fails and tries to clean up the program to be run under the\ninterpreter, we ran into the following freeze:\n\n [...]\n #127/8 tailcall_bpf2bpf_3:FAIL\n [...]\n [ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\n [ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\n [ 92.043707]\n [ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87\n [ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\n [ 92.046785] Call Trace:\n [ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.049019] ? ktime_get+0x117/0x130\n [...] // few hundred [similar] lines more\n [ 92.659025] ? ktime_get+0x117/0x130\n [ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.662378] ? print_usage_bug+0x50/0x50\n [ 92.663221] ? print_usage_bug+0x50/0x50\n [ 92.664077] ? bpf_ksym_find+0x9c/0xe0\n [ 92.664887] ? ktime_get+0x117/0x130\n [ 92.665624] ? kernel_text_address+0xf5/0x100\n [ 92.666529] ? __kernel_text_address+0xe/0x30\n [ 92.667725] ? unwind_get_return_address+0x2f/0x50\n [ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.670185] ? ktime_get+0x117/0x130\n [ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0\n [ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0\n [ 92.675159] ? ktime_get+0x117/0x130\n [ 92.677074] ? lock_is_held_type+0xd5/0x130\n [ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20\n [ 92.680046] ? ktime_get+0x117/0x130\n [ 92.681285] ? __bpf_prog_run32+0x6b/0x90\n [ 92.682601] ? __bpf_prog_run64+0x90/0x90\n [ 92.683636] ? lock_downgrade+0x370/0x370\n [ 92.684647] ? mark_held_locks+0x44/0x90\n [ 92.685652] ? ktime_get+0x117/0x130\n [ 92.686752] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.688004] ? ktime_get+0x117/0x130\n [ 92.688573] ? __cant_migrate+0x2b/0x80\n [ 92.689192] ? bpf_test_run+0x2f4/0x510\n [ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0\n [ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90\n [ 92.691506] ? __kasan_slab_alloc+0x61/0x80\n [ 92.692128] ? eth_type_trans+0x128/0x240\n [ 92.692737] ? __build_skb+0x46/0x50\n [ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50\n [ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\n [ 92.694639] ? __fget_light+0xa1/0x100\n [ 92.695162] ? bpf_prog_inc+0x23/0x30\n [ 92.695685] ? __sys_bpf+0xb40/0x2c80\n [ 92.696324] ? bpf_link_get_from_fd+0x90/0x90\n [ 92.697150] ? mark_held_locks+0x24/0x90\n [ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220\n [ 92.699045] ? finish_task_switch+0xe6/0x370\n [ 92.700072] ? lockdep_hardirqs_on+0x79/0x100\n [ 92.701233] ? finish_task_switch+0x11d/0x370\n [ 92.702264] ? __switch_to+0x2c0/0x740\n [ 92.703148] ? mark_held_locks+0x24/0x90\n [ 92.704155] ? __x64_sys_bpf+0x45/0x50\n [ 92.705146] ? do_syscall_64+0x35/0x80\n [ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae\n [...]\n\nTurns out that the program rejection from e411901c0b77 (\"bpf: allow for tailcalls\nin BPF subprograms for x64 JIT\") is buggy since env->prog->aux->tail_call_reachable\nis never true. Commit ebf7d1f508a7 (\"bpf, x64: rework pro/epilogue and tailcall\nhandling in JIT\") added a tracker into check_max_stack_depth() which propagates\nthe tail_call_reachable condition throughout the subprograms. This info is then\nassigned to the subprogram's \n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige el rechazo de tail_call_reachable para el int\u00e9rprete cuando falla jit. Durante las pruebas de f263a81451c1 (\"bpf: rastrea correctamente los descriptores de inserci\u00f3n del subprog y corrige el use after free\") bajo varias condiciones de fallo, por Por ejemplo, cuando jit_subprogs() falla e intenta limpiar el programa que se ejecutar\u00e1 bajo el int\u00e9rprete, nos encontramos con el siguiente congelamiento: [...] #127/8 tailcall_bpf2bpf_3:FAIL [...] [ 92.041251] ERROR: KASAN: slab fuera de los l\u00edmites en ___bpf_prog_run+0x1b9d/0x2e20 [92.042408] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88800da67f68 por tarea test_progs/682 [92.043707] [92.044030] CPU: 1 PID: 682 Comm: _progs Contaminado: GO 5.13. 0-53301-ge6c08cb33a30-dirty #87 [92.045542] Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 01/04/2014 [92.046785] Seguimiento de llamadas: [92.047171] ? __bpf_prog_run_args64+0xc0/0xc0 [92.047773]? __bpf_prog_run_args32+0x8b/0xb0 [92.048389]? __bpf_prog_run_args64+0xc0/0xc0 [92.049019]? ktime_get+0x117/0x130 [...] // \u00bfunos cientos de l\u00edneas [similares] m\u00e1s [92.659025]? ktime_get+0x117/0x130 [92.659845]? __bpf_prog_run_args64+0xc0/0xc0 [92.660738]? __bpf_prog_run_args32+0x8b/0xb0 [92.661528]? __bpf_prog_run_args64+0xc0/0xc0 [92.662378]? print_usage_bug+0x50/0x50 [92.663221]? print_usage_bug+0x50/0x50 [92.664077]? bpf_ksym_find+0x9c/0xe0 [92.664887]? ktime_get+0x117/0x130 [92.665624]? kernel_text_address+0xf5/0x100 [92.666529]? __kernel_text_address+0xe/0x30 [ 92.667725] ? unwind_get_return_address+0x2f/0x50 [92.668854]? ___bpf_prog_run+0x15d4/0x2e20 [ 92.670185] ? ktime_get+0x117/0x130 [92.671130]? __bpf_prog_run_args64+0xc0/0xc0 [92.672020]? __bpf_prog_run_args32+0x8b/0xb0 [92.672860]? __bpf_prog_run_args64+0xc0/0xc0 [92.675159]? ktime_get+0x117/0x130 [92.677074]? lock_is_held_type+0xd5/0x130 [92.678662]? ___bpf_prog_run+0x15d4/0x2e20 [ 92.680046] ? ktime_get+0x117/0x130 [92.681285]? __bpf_prog_run32+0x6b/0x90 [92.682601]? __bpf_prog_run64+0x90/0x90 [92.683636]? lock_downgrade+0x370/0x370 [92.684647]? mark_held_locks+0x44/0x90 [92.685652]? ktime_get+0x117/0x130 [92.686752]? lockdep_hardirqs_on+0x79/0x100 [92.688004]? ktime_get+0x117/0x130 [92.688573]? __cant_migrate+0x2b/0x80 [ 92.689192] ? bpf_test_run+0x2f4/0x510 [92.689869]? bpf_test_timer_continue+0x1c0/0x1c0 [92.690856]? rcu_read_lock_bh_held+0x90/0x90 [92.691506]? __kasan_slab_alloc+0x61/0x80 [92.692128]? eth_type_trans+0x128/0x240 [92.692737]? __build_skb+0x46/0x50 [92.693252]? bpf_prog_test_run_skb+0x65e/0xc50 [92.693954]? bpf_prog_test_run_raw_tp+0x2d0/0x2d0 [92.694639]? __fget_light+0xa1/0x100 [ 92.695162] ? bpf_prog_inc+0x23/0x30 [92.695685]? __sys_bpf+0xb40/0x2c80 [92.696324]? bpf_link_get_from_fd+0x90/0x90 [92.697150]? mark_held_locks+0x24/0x90 [92.698007]? lockdep_hardirqs_on_prepare+0x124/0x220 [92.699045]? finish_task_switch+0xe6/0x370 [92.700072]? lockdep_hardirqs_on+0x79/0x100 [92.701233]? finish_task_switch+0x11d/0x370 [92.702264]? __switch_to+0x2c0/0x740 [ 92.703148] ? mark_held_locks+0x24/0x90 [92.704155]? __x64_sys_bpf+0x45/0x50 [92.705146]? do_syscall_64+0x35/0x80 [92.706953]? Entry_SYSCALL_64_after_hwframe+0x44/0xae [...] Resulta que el rechazo del programa de e411901c0b77 (\"bpf: permitir tailcalls en subprogramas BPF para x64 JIT\") tiene errores ya que env->prog->aux->tail_call_reachable nunca es cierto. La confirmaci\u00f3n ebf7d1f508a7 (\"bpf, x64: reelaboraci\u00f3n de pro/ep\u00edlogo y manejo de tailcall en JIT\") agreg\u00f3 un rastreador en check_max_stack_ Depth() que propaga la condici\u00f3n tail_call_reachable a trav\u00e9s de los subprogramas. Esta informaci\u00f3n luego se asigna al ---truncado--- del subprograma."}], "id": "CVE-2021-47300", "lastModified": "2024-12-26T20:44:16.713", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-21T15:15:17.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix tail_call_reachable rejection for interpreter when jit failed", "id": "2282483", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282483"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\nDuring testing of f263a81451c1 (\"bpf: Track subprog poke descriptors correctly\nand fix use-after-free\") under various failure conditions, for example, when\njit_subprogs() fails and tries to clean up the program to be run under the\ninterpreter, we ran into the following freeze:\n[...]\n#127/8 tailcall_bpf2bpf_3:FAIL\n[...]\n[ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\n[ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\n[ 92.043707]\n[ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87\n[ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\n[ 92.046785] Call Trace:\n[ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0\n[ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.049019] ? ktime_get+0x117/0x130\n[...] // few hundred [similar] lines more\n[ 92.659025] ? ktime_get+0x117/0x130\n[ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0\n[ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.662378] ? print_usage_bug+0x50/0x50\n[ 92.663221] ? print_usage_bug+0x50/0x50\n[ 92.664077] ? bpf_ksym_find+0x9c/0xe0\n[ 92.664887] ? ktime_get+0x117/0x130\n[ 92.665624] ? kernel_text_address+0xf5/0x100\n[ 92.666529] ? __kernel_text_address+0xe/0x30\n[ 92.667725] ? unwind_get_return_address+0x2f/0x50\n[ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20\n[ 92.670185] ? ktime_get+0x117/0x130\n[ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0\n[ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0\n[ 92.675159] ? ktime_get+0x117/0x130\n[ 92.677074] ? lock_is_held_type+0xd5/0x130\n[ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20\n[ 92.680046] ? ktime_get+0x117/0x130\n[ 92.681285] ? __bpf_prog_run32+0x6b/0x90\n[ 92.682601] ? __bpf_prog_run64+0x90/0x90\n[ 92.683636] ? lock_downgrade+0x370/0x370\n[ 92.684647] ? mark_held_locks+0x44/0x90\n[ 92.685652] ? ktime_get+0x117/0x130\n[ 92.686752] ? lockdep_hardirqs_on+0x79/0x100\n[ 92.688004] ? ktime_get+0x117/0x130\n[ 92.688573] ? __cant_migrate+0x2b/0x80\n[ 92.689192] ? bpf_test_run+0x2f4/0x510\n[ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0\n[ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90\n[ 92.691506] ? __kasan_slab_alloc+0x61/0x80\n[ 92.692128] ? eth_type_trans+0x128/0x240\n[ 92.692737] ? __build_skb+0x46/0x50\n[ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50\n[ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\n[ 92.694639] ? __fget_light+0xa1/0x100\n[ 92.695162] ? bpf_prog_inc+0x23/0x30\n[ 92.695685] ? __sys_bpf+0xb40/0x2c80\n[ 92.696324] ? bpf_link_get_from_fd+0x90/0x90\n[ 92.697150] ? mark_held_locks+0x24/0x90\n[ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220\n[ 92.699045] ? finish_task_switch+0xe6/0x370\n[ 92.700072] ? lockdep_hardirqs_on+0x79/0x100\n[ 92.701233] ? finish_task_switch+0x11d/0x370\n[ 92.702264] ? __switch_to+0x2c0/0x740\n[ 92.703148] ? mark_held_locks+0x24/0x90\n[ 92.704155] ? __x64_sys_bpf+0x45/0x50\n[ 92.705146] ? do_syscall_64+0x35/0x80\n[ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae\n[...]\nTurns out that the program rejection from e411901c0b77 (\"bpf: allow for tailcalls\nin BPF subprograms for x64 JIT\") is buggy since env->prog->aux->tail_call_reachable\nis never true. Commit ebf7d1f508a7 (\"bpf, x64: rework pro/epilogue and tailcall\nhandling in JIT\") added a tracker into check_max_stack_depth() which propagates\nthe tail_call_reachable condition throughout the subprograms. This info is then\nassigned to the subprogram's \n---truncated---"], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47300", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47300\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47300\nhttps://lore.kernel.org/linux-cve-announce/2024052125-CVE-2021-47300-eee0@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because an out-of-bounds memory access, which could lead to crashes or unexpected behavior, but does not provide direct mechanisms for unauthorized access or data manipulation.", "threat_severity": "Moderate"}

{}