FKIE_CVE-2026-53238

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-06-30 14:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: netlabel: validate unlabeled address and mask attribute lengths netlbl_unlabel_addrinfo_get() used the address attribute length to determine whether the attribute data could be read as an IPv4 or IPv6 address, but did not independently validate the corresponding mask attribute length. A crafted Generic Netlink request could therefore provide a valid IPv4/IPv6 address attribute with a shorter mask attribute, which would later be read as a full struct in_addr or struct in6_addr. NLA_BINARY policy lengths are maximum lengths by default, so use NLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask attributes. This rejects short attributes during policy validation and also exposes the exact length requirements through policy introspection.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netlabel/netlabel_unlabeled.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "975a84fd741440853380d37465b6e226cf47254c",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "672f0f3b8f875ffe6525a37847eafa7648c4c0c6",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "95bda3eac0b1454c2cee98d58d9ba6dd8391e843",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "71c52da13c3737493b42d20d9f33de34e03b3156",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "ccfe292a966079c61ea68a2da303b2a336170993",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            },
            {
              "lessThan": "9772589b57e44aedc240211c5c3f7a684a034d3a",
              "status": "affected",
              "version": "8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netlabel/netlabel_unlabeled.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlabel: validate unlabeled address and mask attribute lengths\n\nnetlbl_unlabel_addrinfo_get() used the address attribute length to\ndetermine whether the attribute data could be read as an IPv4 or IPv6\naddress, but did not independently validate the corresponding mask\nattribute length.  A crafted Generic Netlink request could therefore\nprovide a valid IPv4/IPv6 address attribute with a shorter mask\nattribute, which would later be read as a full struct in_addr or\nstruct in6_addr.\n\nNLA_BINARY policy lengths are maximum lengths by default, so use\nNLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask\nattributes.  This rejects short attributes during policy validation and\nalso exposes the exact length requirements through policy introspection."
    }
  ],
  "id": "CVE-2026-53238",
  "lastModified": "2026-06-30T14:44:27.313",
  "metrics": {},
  "published": "2026-06-25T09:16:41.713",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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