PT-2026-52333 · Linux · Linux

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-53238

NVD

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.

Related Identifiers

CVE-2026-53238

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-53238 · Security Note
• https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c · Note
• https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843 · Note
• https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6 · Note
• https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993 · Note
• https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156 · Note
• https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a · Note
• https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8 · Note
• https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6 · Note