{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-35892", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.113Z", "datePublished": "2024-05-19T08:34:47.914Z", "dateUpdated": "2026-05-11T20:13:15.828Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:13:15.828Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n <TASK>\n [<ffffffff85b85f14>] __dump_stack lib/dump_stack.c:88 [inline]\n [<ffffffff85b85f14>] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n [<ffffffff85b86007>] dump_stack+0x15/0x1e lib/dump_stack.c:113\n [<ffffffff81802299>] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n [<ffffffff84f0054c>] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n [<ffffffff84f037c3>] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n [<ffffffff84f5b78c>] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n [<ffffffff84fbcf63>] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n [<ffffffff84fbcf63>] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n [<ffffffff84eecab9>] dequeue_skb net/sched/sch_generic.c:292 [inline]\n [<ffffffff84eecab9>] qdisc_restart net/sched/sch_generic.c:397 [inline]\n [<ffffffff84eecab9>] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n [<ffffffff84d7aa96>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n [<ffffffff84d85d29>] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n [<ffffffff85e002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n [<ffffffff81568bca>] invoke_softirq kernel/softirq.c:447 [inline]\n [<ffffffff81568bca>] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n [<ffffffff81568ae9>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n [<ffffffff85b89f52>] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n [<ffffffff85c00ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_api.c"], "versions": [{"version": "9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3", "lessThan": "b7d1ce2cc7192e8a037faa3f5d3ba72c25976460", "status": "affected", "versionType": "git"}, {"version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e", "status": "affected", "versionType": "git"}, {"version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "07696415526bee0607e495017369c7303a4792e1", "status": "affected", "versionType": "git"}, {"version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "7eb322360b0266481e560d1807ee79e0cef5742b", "status": "affected", "versionType": "git"}, {"version": "3a4741bb13caf482b877b10ac1bcf7390cad7077", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_api.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "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": "6.1.34", "versionEndExcluding": "6.1.85"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.26"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.8.5"}, {"vulnerable": true, "criteria": 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"2024-05-23T19:36:07.702598Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:22.702Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.741Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.741Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-35892", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-23T19:36:07.702598Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:36:12.852Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3", "lessThan": "b7d1ce2cc7192e8a037faa3f5d3ba72c25976460", "versionType": "git"}, {"status": "affected", "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e", "versionType": "git"}, {"status": "affected", "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "07696415526bee0607e495017369c7303a4792e1", "versionType": "git"}, {"status": "affected", "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "lessThan": "7eb322360b0266481e560d1807ee79e0cef5742b", "versionType": "git"}, {"status": "affected", "version": "3a4741bb13caf482b877b10ac1bcf7390cad7077", "versionType": "git"}], "programFiles": ["net/sched/sch_api.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"status": "unaffected", "version": "0", "lessThan": "6.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.85", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.26", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.5", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/sch_api.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"}, {"url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"}, {"url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"}, {"url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n <TASK>\n [<ffffffff85b85f14>] __dump_stack lib/dump_stack.c:88 [inline]\n [<ffffffff85b85f14>] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n [<ffffffff85b86007>] dump_stack+0x15/0x1e lib/dump_stack.c:113\n [<ffffffff81802299>] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n [<ffffffff84f0054c>] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n [<ffffffff84f037c3>] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n [<ffffffff84f5b78c>] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n [<ffffffff84fbcf63>] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n [<ffffffff84fbcf63>] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n [<ffffffff84eecab9>] dequeue_skb net/sched/sch_generic.c:292 [inline]\n [<ffffffff84eecab9>] qdisc_restart net/sched/sch_generic.c:397 [inline]\n [<ffffffff84eecab9>] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n [<ffffffff84d7aa96>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n [<ffffffff84d85d29>] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n [<ffffffff85e002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n [<ffffffff81568bca>] invoke_softirq kernel/softirq.c:447 [inline]\n [<ffffffff81568bca>] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n [<ffffffff81568ae9>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n [<ffffffff85b89f52>] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n [<ffffffff85c00ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.85", "versionStartIncluding": "6.1.34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.26", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.5", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.3.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T12:56:01.353Z"}}}, "cveMetadata": {"cveId": "CVE-2024-35892", "state": "PUBLISHED", "dateUpdated": "2025-05-04T12:56:01.353Z", "dateReserved": "2024-05-17T13:50:33.113Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-19T08:34:47.914Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4C624EBB-880F-45BF-B0B9-336AABC3C61F", "versionEndExcluding": "6.1.85", "versionStartIncluding": "6.1.34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "378F88D2-FE75-4F7D-BD8C-513E60387ABB", "versionEndExcluding": "6.6.26", "versionStartIncluding": "6.3.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DBD6C99E-4250-4DFE-8447-FF2075939D10", "versionEndExcluding": "6.8.5", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*", "matchCriteriaId": "22BEDD49-2C6D-402D-9DBF-6646F6ECD10B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*", "matchCriteriaId": "DF73CB2A-DFFD-46FB-9BFE-AA394F27EA37", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n <TASK>\n [<ffffffff85b85f14>] __dump_stack lib/dump_stack.c:88 [inline]\n [<ffffffff85b85f14>] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n [<ffffffff85b86007>] dump_stack+0x15/0x1e lib/dump_stack.c:113\n [<ffffffff81802299>] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n [<ffffffff84f0054c>] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n [<ffffffff84f037c3>] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n [<ffffffff84f5b78c>] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n [<ffffffff84fbcf63>] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n [<ffffffff84fbcf63>] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n [<ffffffff84eecab9>] dequeue_skb net/sched/sch_generic.c:292 [inline]\n [<ffffffff84eecab9>] qdisc_restart net/sched/sch_generic.c:397 [inline]\n [<ffffffff84eecab9>] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n [<ffffffff84d7aa96>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n [<ffffffff84d85d29>] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n [<ffffffff85e002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n [<ffffffff81568bca>] invoke_softirq kernel/softirq.c:447 [inline]\n [<ffffffff81568bca>] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n [<ffffffff81568ae9>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n [<ffffffff85b89f52>] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n [<ffffffff85c00ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/sched: corrige lockdep splat en qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() se llama con el bloqueo de qdisc retenido, no con RTNL. Debemos usar qdisc_lookup_rcu() en lugar de qdisc_lookup() syzbot inform\u00f3: ADVERTENCIA: uso sospechoso de RCU 6.1.74-syzkaller #0 No contaminado ---------------------- ------- \u00a1net/sched/sch_api.c:305 uso sospechoso de rcu_dereference_protected()! otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: rcu_scheduler_active = 2, debug_locks = 1 3 bloqueos mantenidos por udevd/1142: #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux /rcupdate.h:306 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock ){....}-{1:2}, en: net_tx_action+0x64a/0x970 net/core/dev.c:5282 #1: ffff888171861108 (&amp;sch-&gt;q.lock){+.-.}-{ 2:2}, en: spin_lock include/linux/spinlock.h:350 [en l\u00ednea] #1: ffff888171861108 (&amp;sch-&gt;q.lock){+.-.}-{2:2}, en: net_tx_action+0x754 /0x970 net/core/dev.c:5297 #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux/rcupdate.h:306 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2} , en: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792 stack backtrace: CPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 Seguimiento de llamadas: [] __dump_stack lib/dump_stack.c:88 [en l\u00ednea] [] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106 [ ] dump_stack+0x15/0x1e lib/dump_stack.c:113 [] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592 [] qdisc_lookup+0xac/0x6f0 net/sched/sch_a foto.c: 305 [] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811 [] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51 [ ] qdisc_enqueue incluye/net/sch_generic .h:833 [en l\u00ednea] [] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723 [] dequeue_skb net/sched/sch_generic.c:292 [en l\u00ednea] [] qdisc_restart net/sched/sch_generic.c:397 [en l\u00ednea] [] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415 [] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125 [] net_tx_action+0x7c9/0x970 net/core/dev.c:5313 [] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616 [] invoke_softirq kernel/softirq.c: 447 [ en l\u00ednea] [] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700 [] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712 [] sysvec_apic_timer_interrupt+0 x42/0x90 arco/x86/ kernel/apic/apic.c:1107 [] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"}], "id": "CVE-2024-35892", "lastModified": "2025-09-19T18:51:15.077", "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": "2024-05-19T09:15:10.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()", "id": "2281684", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2281684"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\nsyzbot reported:\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\nother info that might help us debug this:\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n#0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n#0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n#0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n#1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n#1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n#2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n#2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n#2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n<TASK>\n[<ffffffff85b85f14>] __dump_stack lib/dump_stack.c:88 [inline]\n[<ffffffff85b85f14>] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n[<ffffffff85b86007>] dump_stack+0x15/0x1e lib/dump_stack.c:113\n[<ffffffff81802299>] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n[<ffffffff84f0054c>] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n[<ffffffff84f037c3>] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n[<ffffffff84f5b78c>] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n[<ffffffff84fbcf63>] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n[<ffffffff84fbcf63>] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n[<ffffffff84eecab9>] dequeue_skb net/sched/sch_generic.c:292 [inline]\n[<ffffffff84eecab9>] qdisc_restart net/sched/sch_generic.c:397 [inline]\n[<ffffffff84eecab9>] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n[<ffffffff84d7aa96>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n[<ffffffff84d85d29>] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n[<ffffffff85e002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n[<ffffffff81568bca>] invoke_softirq kernel/softirq.c:447 [inline]\n[<ffffffff81568bca>] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n[<ffffffff81568ae9>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n[<ffffffff85b89f52>] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n[<ffffffff85c00ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656", "CVE-2024-35892 is a vulnerability in the Linux kernel\u2019s network scheduler caused by improper use of the qdisc_lookup() function. This function assumes the global RTNL lock is held, but in the qdisc_tree_reduce_backlog() function, only a local queue lock is used. This mismatch creates a race condition that could lead to system instability or crashes. The issue has been fixed by replacing qdisc_lookup() with an RCU-safe version that works correctly in this context."], "name": "CVE-2024-35892", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-35892\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-35892\nhttps://lore.kernel.org/linux-cve-announce/2024051949-CVE-2024-35892-0f0c@gregkh/T"], "threat_severity": "Moderate"}

{}