{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72242", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.914Z", "datePublished": "2026-08-15T05:54:30.378Z", "dateUpdated": "2026-08-23T12:47:05.827Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:05.827Z" }, "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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/selinux/hooks.c" ], "versions": [ { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "2fcaf133a8fd88b69f32ebaecad93fd302da828f", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "a4bc2fb8536488b37680c0b66c59434a4b7f8c2f", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "cc8bd47b35eca82393cbad08b1cc86f02e034439", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "d61a80b17254be7230bc5544f8e62ddf21ab38e2", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb", "status": "affected", "versionType": "git" }, { "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a", "lessThan": "56acfeb10019e200ab6787d01f8d7cbe0f01526f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/selinux/hooks.c" ], "versions": [ { "version": "4.17", "status": "affected" }, { "version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.17", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55" }, { "url": "https://git.kernel.org/stable/c/2fcaf133a8fd88b69f32ebaecad93fd302da828f" }, { "url": "https://git.kernel.org/stable/c/a4bc2fb8536488b37680c0b66c59434a4b7f8c2f" }, { "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" } } } }