PT-2026-43969 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46101

Mitre

In the Linux kernel, the following vulnerability has been resolved:

netfilter: reject zero shift in nft bitwise

Reject zero shift operands for nft bitwise left and right shift expressions during initialization.

The carry propagation logic computes the carry from the adjacent 32-bit word using BITS PER TYPE(u32) - shift. A zero shift operand turns this into a 32-bit shift, which is undefined behaviour.

Reject zero shift operands in the control plane, alongside the existing check for values greater than or equal to 32, so malformed rules never reach the packet path.

Related Identifiers

CVE-2026-46101

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46101 · Security Note
• https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95 · Note
• https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b · Note
• https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853 · Note
• https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14 · Note
• https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07 · Note