CVE-2026-72242 (GCVE-0-2026-72242)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-08-23 12:47
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
Version: d452930fd3b9031e59abfeddb2fa383f1403d61a
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{
  "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": [
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              "status": "affected",
              "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "d452930fd3b9031e59abfeddb2fa383f1403d61a",
              "versionType": "git"
            },
            {
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              "status": "affected",
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            },
            {
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              "status": "affected",
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            {
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            }
          ]
        },
        {
          "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": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "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": "5.10.266",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.184",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "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-\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": {
            "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-\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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:47:05.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "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": "2026-08-23T12:47:05.827Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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