CVE-2026-53238

netlabel: validate unlabeled address and mask attribute lengths

State: Published
Severity: Not scored
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Jun 9, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 975a84fd741440853380d37465b6e226cf47254cAffected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 672f0f3b8f875ffe6525a37847eafa7648c4c0c6Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 95bda3eac0b1454c2cee98d58d9ba6dd8391e843Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 71c52da13c3737493b42d20d9f33de34e03b3156Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before ccfe292a966079c61ea68a2da303b2a336170993Affected 8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 9772589b57e44aedc240211c5c3f7a684a034d3aAffected
LinuxLinux	2.6.25Affected before 2.6.25Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 975a84fd741440853380d37465b6e226cf47254cAffected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 672f0f3b8f875ffe6525a37847eafa7648c4c0c6Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 95bda3eac0b1454c2cee98d58d9ba6dd8391e843Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 71c52da13c3737493b42d20d9f33de34e03b3156Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before ccfe292a966079c61ea68a2da303b2a336170993Affected
8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd to before 9772589b57e44aedc240211c5c3f7a684a034d3aAffected

LinuxLinux

2.6.25Affected
before 2.6.25Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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