netlabel: validate unlabeled address and mask attribute lengths

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Summary

CVECVE-2026-53238
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:41 UTC
Updated2026-06-25 09:16:41 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 975a84fd741440853380d37465b6e226cf47254c git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 672f0f3b8f875ffe6525a37847eafa7648c4c0c6 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 95bda3eac0b1454c2cee98d58d9ba6dd8391e843 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 71c52da13c3737493b42d20d9f33de34e03b3156 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd ccfe292a966079c61ea68a2da303b2a336170993 git Not specified
CNA Linux Linux affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd 9772589b57e44aedc240211c5c3f7a684a034d3a git Not specified
CNA Linux Linux affected 2.6.25 Not specified
CNA Linux Linux unaffected 2.6.25 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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