{"api_version":"1","generated_at":"2026-08-22T07:08:09+00:00","cve":"CVE-2026-72242","urls":{"html":"https://cve.report/CVE-2026-72242","api":"https://cve.report/api/cve/CVE-2026-72242.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72242","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72242"},"summary":{"title":"selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: avoid sk_socket dereference in selinux_sctp_bind_connect()\n\nselinux_sctp_bind_connect() dereferences sk->sk_socket to pass a\nstruct socket * to selinux_socket_bind() and\nselinux_socket_connect_helper().  However, when the hook is invoked\nfrom the ASCONF softirq path (sctp_process_asconf), there is no file\nreference guaranteeing that sk->sk_socket is non-NULL.  The setsockopt\ncallers (bindx, connectx, set_primary, sendmsg connect) hold a file\nreference and are not affected.\n\nBoth selinux_socket_bind() and selinux_socket_connect_helper()\nimmediately resolve sock->sk, never using the struct socket * for\nanything else.  Refactor the inner logic into helpers that take a\nstruct sock * directly so that selinux_sctp_bind_connect() never needs\nto touch sk->sk_socket at all.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:51","updated_at":"2026-08-17 06:18:25"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/d61a80b17254be7230bc5544f8e62ddf21ab38e2","name":"https://git.kernel.org/stable/c/d61a80b17254be7230bc5544f8e62ddf21ab38e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc8bd47b35eca82393cbad08b1cc86f02e034439","name":"https://git.kernel.org/stable/c/cc8bd47b35eca82393cbad08b1cc86f02e034439","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4","name":"https://git.kernel.org/stable/c/5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/56acfeb10019e200ab6787d01f8d7cbe0f01526f","name":"https://git.kernel.org/stable/c/56acfeb10019e200ab6787d01f8d7cbe0f01526f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb","name":"https://git.kernel.org/stable/c/37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72242","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72242","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d452930fd3b9031e59abfeddb2fa383f1403d61a 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d452930fd3b9031e59abfeddb2fa383f1403d61a cc8bd47b35eca82393cbad08b1cc86f02e034439 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d452930fd3b9031e59abfeddb2fa383f1403d61a d61a80b17254be7230bc5544f8e62ddf21ab38e2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d452930fd3b9031e59abfeddb2fa383f1403d61a 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d452930fd3b9031e59abfeddb2fa383f1403d61a 56acfeb10019e200ab6787d01f8d7cbe0f01526f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72242","cve":"CVE-2026-72242","epss":"0.005950000","percentile":"0.456210000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["security/selinux/hooks.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4","status":"affected","version":"d452930fd3b9031e59abfeddb2fa383f1403d61a","versionType":"git"},{"lessThan":"cc8bd47b35eca82393cbad08b1cc86f02e034439","status":"affected","version":"d452930fd3b9031e59abfeddb2fa383f1403d61a","versionType":"git"},{"lessThan":"d61a80b17254be7230bc5544f8e62ddf21ab38e2","status":"affected","version":"d452930fd3b9031e59abfeddb2fa383f1403d61a","versionType":"git"},{"lessThan":"37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb","status":"affected","version":"d452930fd3b9031e59abfeddb2fa383f1403d61a","versionType":"git"},{"lessThan":"56acfeb10019e200ab6787d01f8d7cbe0f01526f","status":"affected","version":"d452930fd3b9031e59abfeddb2fa383f1403d61a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["security/selinux/hooks.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.17"},{"lessThan":"4.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: avoid sk_socket dereference in selinux_sctp_bind_connect()\n\nselinux_sctp_bind_connect() dereferences sk->sk_socket to pass a\nstruct socket * to selinux_socket_bind() and\nselinux_socket_connect_helper().  However, when the hook is invoked\nfrom the ASCONF softirq path (sctp_process_asconf), there is no file\nreference guaranteeing that sk->sk_socket is non-NULL.  The setsockopt\ncallers (bindx, connectx, set_primary, sendmsg connect) hold a file\nreference and are not affected.\n\nBoth selinux_socket_bind() and selinux_socket_connect_helper()\nimmediately resolve sock->sk, never using the struct socket * for\nanything else.  Refactor the inner logic into helpers that take a\nstruct sock * directly so that selinux_sctp_bind_connect() never needs\nto touch sk->sk_socket at all."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable code runs in the SCTP receive softirq path when a remote peer sends an authenticated ASCONF chunk (ADD_IP/SET_PRIMARY) on an existing association; packets enter via sctp_rcv() from the network stack, not local syscalls.\nAC:L - An attacker with an established SCTP association controls ASCONF timing and can flood ADD_IP/SET_PRIMARY during the documented post-close() teardown window when sk_socket is NULL but associations still process shutdown-state packets.\nPR:N - Exploitation requires only the ability to complete a normal SCTP association handshake with a SELinux-protected peer; no Linux capabilities, root, or local shell access are needed to send the triggering ASCONF packets over the network.\nUI:N - No victim user action is required beyond normal server operation; the crash is triggered by attacker-sent ASCONF traffic arriving while the kernel processes socket teardown after application close(), not by opening files or clicking links.\nS:U - Impact is a kernel NULL pointer dereference panic/oops within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries and is a standard remote denial-of-service against the host kernel.\nC:N - The failure mode is a direct NULL pointer dereference of sk->sk_socket before reading sock->sk; there is no use-after-free, out-of-bounds access, or memory corruption that could yield information disclosure.\nI:N - The bug does not write or corrupt memory; selinux_socket_bind()/connect_helper() crash immediately on the NULL socket pointer without modifying kernel data structures or achieving code execution.\nA:H - Dereferencing a NULL sk_socket in softirq causes a kernel oops/panic, crashing the entire system; this is repeatable whenever ASCONF arrives during the post-close() window on SCTP associations in shutdown states."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:55.152Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4"},{"url":"https://git.kernel.org/stable/c/cc8bd47b35eca82393cbad08b1cc86f02e034439"},{"url":"https://git.kernel.org/stable/c/d61a80b17254be7230bc5544f8e62ddf21ab38e2"},{"url":"https://git.kernel.org/stable/c/37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb"},{"url":"https://git.kernel.org/stable/c/56acfeb10019e200ab6787d01f8d7cbe0f01526f"}],"title":"selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72242","datePublished":"2026-08-15T05:54:30.378Z","dateReserved":"2026-08-09T03:40:39.914Z","dateUpdated":"2026-08-17T05:41:55.152Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:51","lastModifiedDate":"2026-08-17 06:18:25","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72242","Ordinal":"1","Title":"selinux: avoid sk_socket dereference in selinux_sctp_bind_connec","CVE":"CVE-2026-72242","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72242","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: avoid sk_socket dereference in selinux_sctp_bind_connect()\n\nselinux_sctp_bind_connect() dereferences sk->sk_socket to pass a\nstruct socket * to selinux_socket_bind() and\nselinux_socket_connect_helper().  However, when the hook is invoked\nfrom the ASCONF softirq path (sctp_process_asconf), there is no file\nreference guaranteeing that sk->sk_socket is non-NULL.  The setsockopt\ncallers (bindx, connectx, set_primary, sendmsg connect) hold a file\nreference and are not affected.\n\nBoth selinux_socket_bind() and selinux_socket_connect_helper()\nimmediately resolve sock->sk, never using the struct socket * for\nanything else.  Refactor the inner logic into helpers that take a\nstruct sock * directly so that selinux_sctp_bind_connect() never needs\nto touch sk->sk_socket at all.","Type":"Description","Title":"selinux: avoid sk_socket dereference in selinux_sctp_bind_connec"}]}}}