CVE-2026-46104 (GCVE-0-2026-46104)
Vulnerability from cvelistv5
Published
2026-05-28 09:35
Modified
2026-06-14 17:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: selinux: use sk blob accessor in socket permission helpers SELinux socket state lives in the composite LSM socket blob. sock_has_perm() and nlmsg_sock_has_extended_perms() currently dereference sk->sk_security directly, which assumes the SELinux socket blob is at offset zero. In stacked configurations that assumption does not hold. If another LSM allocates socket blob storage before SELinux, these helpers may read the wrong blob and feed invalid SID and class values into AVC checks. Use selinux_sock() instead of accessing sk->sk_security directly.
References
Impacted products
Vendor Product Version
Linux Linux Version: d1d991efaf34606d500dcbd28bedc0666eeec8e2
Version: d1d991efaf34606d500dcbd28bedc0666eeec8e2
Version: d1d991efaf34606d500dcbd28bedc0666eeec8e2
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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": [
            {
              "lessThan": "d350fef4bc2467fe1bce15f7a20fe60e01ce41ad",
              "status": "affected",
              "version": "d1d991efaf34606d500dcbd28bedc0666eeec8e2",
              "versionType": "git"
            },
            {
              "lessThan": "7eca71f57f194c1638ebb7f4097d6be8fd04c101",
              "status": "affected",
              "version": "d1d991efaf34606d500dcbd28bedc0666eeec8e2",
              "versionType": "git"
            },
            {
              "lessThan": "032e70aff025d7c519af9ab791cd084380619263",
              "status": "affected",
              "version": "d1d991efaf34606d500dcbd28bedc0666eeec8e2",
              "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": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: use sk blob accessor in socket permission helpers\n\nSELinux socket state lives in the composite LSM socket blob.\n\nsock_has_perm() and nlmsg_sock_has_extended_perms() currently\ndereference sk-\u003esk_security directly, which assumes the SELinux socket\nblob is at offset zero.\n\nIn stacked configurations that assumption does not hold. If another LSM\nallocates socket blob storage before SELinux, these helpers may read the\nwrong blob and feed invalid SID and class values into AVC checks.\n\nUse selinux_sock() instead of accessing sk-\u003esk_security directly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:54:43.918Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d350fef4bc2467fe1bce15f7a20fe60e01ce41ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/7eca71f57f194c1638ebb7f4097d6be8fd04c101"
        },
        {
          "url": "https://git.kernel.org/stable/c/032e70aff025d7c519af9ab791cd084380619263"
        }
      ],
      "title": "selinux: use sk blob accessor in socket permission helpers",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46104",
    "datePublished": "2026-05-28T09:35:07.397Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-06-14T17:54:43.918Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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