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CVE-2026-72242 (GCVE-0-2026-72242)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-23 12:47
VLAI
Title
selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()
Summary
In the Linux kernel, the following vulnerability has been resolved: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a struct socket * to selinux_socket_bind() and selinux_socket_connect_helper(). However, when the hook is invoked from the ASCONF softirq path (sctp_process_asconf), there is no file reference guaranteeing that sk->sk_socket is non-NULL. The setsockopt callers (bindx, connectx, set_primary, sendmsg connect) hold a file reference and are not affected. Both selinux_socket_bind() and selinux_socket_connect_helper() immediately resolve sock->sk, never using the struct socket * for anything else. Refactor the inner logic into helpers that take a struct sock * directly so that selinux_sctp_bind_connect() never needs to touch sk->sk_socket at all.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55 (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < 2fcaf133a8fd88b69f32ebaecad93fd302da828f (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < a4bc2fb8536488b37680c0b66c59434a4b7f8c2f (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4 (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < cc8bd47b35eca82393cbad08b1cc86f02e034439 (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < d61a80b17254be7230bc5544f8e62ddf21ab38e2 (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb (git)
Affected: d452930fd3b9031e59abfeddb2fa383f1403d61a , < 56acfeb10019e200ab6787d01f8d7cbe0f01526f (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "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-\u003esk_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-\u003esk_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-\u003esk, 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-\u003esk_socket at all."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "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-\u003esk_socket before reading sock-\u003esk; 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."
            }
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        "dateUpdated": "2026-08-23T12:47:05.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fcaf133a8fd88b69f32ebaecad93fd302da828f"
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          "url": "https://git.kernel.org/stable/c/a4bc2fb8536488b37680c0b66c59434a4b7f8c2f"
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        {
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    "datePublished": "2026-08-15T05:54:30.378Z",
    "dateReserved": "2026-08-09T03:40:39.914Z",
    "dateUpdated": "2026-08-23T12:47:05.827Z",
    "state": "PUBLISHED"
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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-\u003esk, 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-\u003esk_socket at all.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"security/selinux/hooks.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"2fcaf133a8fd88b69f32ebaecad93fd302da828f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"a4bc2fb8536488b37680c0b66c59434a4b7f8c2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"cc8bd47b35eca82393cbad08b1cc86f02e034439\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"d61a80b17254be7230bc5544f8e62ddf21ab38e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d452930fd3b9031e59abfeddb2fa383f1403d61a\",\"lessThan\":\"56acfeb10019e200ab6787d01f8d7cbe0f01526f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"security/selinux/hooks.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2fcaf133a8fd88b69f32ebaecad93fd302da828f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56acfeb10019e200ab6787d01f8d7cbe0f01526f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4bc2fb8536488b37680c0b66c59434a4b7f8c2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc8bd47b35eca82393cbad08b1cc86f02e034439\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d61a80b17254be7230bc5544f8e62ddf21ab38e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T10:51:06+00:00",
      "cve": "CVE-2026-72242",
      "id": "CVE-2026-72242",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72242.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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