netlabel: validate unlabeled address and mask attribute lengths

{
  "id": "b141651c6d52f2d3b6b3f4bc932b1e510043c63fc3d6ea447583f32c43169c82",
  "url": "https://osv.dev/vulnerability/CVE-2026-53238",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netlabel: validate unlabeled address and mask attribute lengths",
    "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.",
    "evidence": "osv:CVE-2026-53238",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.259",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.210",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.176",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.94",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53238",
      "aliases": [
        "CVE-2026-53238"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "975a84fd741440853380d37465b6e226cf47254c"
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                {
                  "fixed": "672f0f3b8f875ffe6525a37847eafa7648c4c0c6"
                },
                {
                  "fixed": "95bda3eac0b1454c2cee98d58d9ba6dd8391e843"
                },
                {
                  "fixed": "07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6"
                },
                {
                  "fixed": "71c52da13c3737493b42d20d9f33de34e03b3156"
                },
                {
                  "fixed": "0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8"
                },
                {
                  "fixed": "ccfe292a966079c61ea68a2da303b2a336170993"
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                {
                  "fixed": "9772589b57e44aedc240211c5c3f7a684a034d3a"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53238.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.25"
                },
                {
                  "fixed": "5.10.259"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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                  "fixed": "5.15.210"
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                  "introduced": "5.16.0"
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                  "introduced": "6.2.0"
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                  "introduced": "6.7.0"
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                  "introduced": "6.13.0"
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                  "introduced": "6.19.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53238.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.585806848Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6",
        "https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8",
        "https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6",
        "https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156",
        "https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843",
        "https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c",
        "https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a",
        "https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53238.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53238",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53238.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53238",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 500311,
  "published_at": "2026-06-25T08:39:34.492+00:00"
}