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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
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
References
Impacted 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)
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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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{
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          "programFiles": [
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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",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c"
        },
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    "cveId": "CVE-2026-53238",
    "datePublished": "2026-06-25T08:39:34.492Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-06-25T08:39:34.492Z",
    "state": "PUBLISHED"
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      "date": "2026-07-01",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netlabel/netlabel_unlabeled.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"975a84fd741440853380d37465b6e226cf47254c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"672f0f3b8f875ffe6525a37847eafa7648c4c0c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"95bda3eac0b1454c2cee98d58d9ba6dd8391e843\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"71c52da13c3737493b42d20d9f33de34e03b3156\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"ccfe292a966079c61ea68a2da303b2a336170993\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd\",\"lessThan\":\"9772589b57e44aedc240211c5c3f7a684a034d3a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netlabel/netlabel_unlabeled.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.