{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40281", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.184Z", "datePublished": "2025-12-06T21:51:05.208Z", "dateUpdated": "2026-05-11T21:46:18.993Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:46:18.993Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto\n\nsyzbot reported a possible shift-out-of-bounds [1]\n\nBlamed commit added rto_alpha_max and rto_beta_max set to 1000.\n\nIt is unclear if some sctp users are setting very large rto_alpha\nand/or rto_beta.\n\nIn order to prevent user regression, perform the test at run time.\n\nAlso add READ_ONCE() annotations as sysctl values can change under us.\n\n[1]\n\nUBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41\nshift exponent 64 is too large for 32-bit type 'unsigned int'\nCPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:233 [inline]\n __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494\n sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509\n sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502\n sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338\n sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline]\n sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/transport.c"], "versions": [{"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "0e0413e3315199b23ff4aec295e256034cd0a6e4", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "834e65be429c0fa4f9bb5945064bd57f18ed2187", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "d0d858652834dcf531342c82a0428170aa7c2675", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "ed71f801249d2350c77a73dca2c03918a15a62fe", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "1cfa4eac275cc4875755c1303d48a4ddfe507ca8", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d", "status": "affected", "versionType": "git"}, {"version": "b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b", "lessThan": "1534ff77757e44bcc4b98d0196bc5c0052fce5fa", "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/sctp/transport.c"], "versions": [{"version": "3.16", "status": "affected"}, {"version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.302", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.59", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.9", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "3.16", "versionEndExcluding": "5.4.302"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "5.10.247"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "5.15.197"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.1.159"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.6.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.12.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.17.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4"}, {"url": "https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187"}, {"url": "https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a"}, {"url": "https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675"}, {"url": "https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe"}, {"url": "https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8"}, {"url": "https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d"}, {"url": "https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa"}], "title": "sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto\n\nsyzbot reported a possible shift-out-of-bounds [1]\n\nBlamed commit added rto_alpha_max and rto_beta_max set to 1000.\n\nIt is unclear if some sctp users are setting very large rto_alpha\nand/or rto_beta.\n\nIn order to prevent user regression, perform the test at run time.\n\nAlso add READ_ONCE() annotations as sysctl values can change under us.\n\n[1]\n\nUBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41\nshift exponent 64 is too large for 32-bit type 'unsigned int'\nCPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:233 [inline]\n __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494\n sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509\n sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502\n sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338\n sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline]\n sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]"}], "id": "CVE-2025-40281", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-12-06T22:15:56.113", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto", "id": "2419957", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419957"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto\nsyzbot reported a possible shift-out-of-bounds [1]\nBlamed commit added rto_alpha_max and rto_beta_max set to 1000.\nIt is unclear if some sctp users are setting very large rto_alpha\nand/or rto_beta.\nIn order to prevent user regression, perform the test at run time.\nAlso add READ_ONCE() annotations as sysctl values can change under us.\n[1]\nUBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41\nshift exponent 64 is too large for 32-bit type 'unsigned int'\nCPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:94 [inline]\ndump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120\nubsan_epilogue lib/ubsan.c:233 [inline]\n__ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494\nsctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509\nsctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502\nsctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338\nsctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline]\nsctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]"], "name": "CVE-2025-40281", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40281\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40281\nhttps://lore.kernel.org/linux-cve-announce/2025120718-CVE-2025-40281-557d@gregkh/T"], "threat_severity": "Moderate"}

{}