Vulnerability-Lookup

GHSA-5QWX-4Q7J-HWM2

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53238"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:41Z",
    "severity": null
  },
  "details": "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": "GHSA-5qwx-4q7j-hwm2",
  "modified": "2026-06-25T09:31:22Z",
  "published": "2026-06-25T09:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53238"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53238 (GCVE-0-2026-53238)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/975a84fd741440853…
https://git.kernel.org/stable/c/672f0f3b8f875ffe6…
https://git.kernel.org/stable/c/95bda3eac0b1454c2…
https://git.kernel.org/stable/c/07a18f5c90dd3d586…
https://git.kernel.org/stable/c/71c52da13c3737493…
https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6…
https://git.kernel.org/stable/c/ccfe292a966079c61…
https://git.kernel.org/stable/c/9772589b57e44aedc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 975a84fd741440853380d37465b6e226cf47254c (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 672f0f3b8f875ffe6525a37847eafa7648c4c0c6 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 95bda3eac0b1454c2cee98d58d9ba6dd8391e843 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 71c52da13c3737493b42d20d9f33de34e03b3156 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < ccfe292a966079c61ea68a2da303b2a336170993 (git) Affected: 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd , < 9772589b57e44aedc240211c5c3f7a684a034d3a (git)
Linux	Linux	Affected: 2.6.25 Unaffected: 0 , < 2.6.25 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netlabel/netlabel_unlabeled.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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            },
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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          ],
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          "vendor": "Linux",
          "versions": [
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            },
            {
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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                }
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      "descriptions": [
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:34.492Z",
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        {
          "url": "https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a"
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      ],
      "title": "netlabel: validate unlabeled address and mask attribute lengths",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53238",
    "datePublished": "2026-06-25T08:39:34.492Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5QWX-4Q7J-HWM2

CVE-2026-53238 (GCVE-0-2026-53238)

Tags

Sightings

Nomenclature