CVE-2026-72350

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.

References

• https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29
• https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a
• https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8
• https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811
• https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17