netfilter: reject zero shift in nft_bitwise

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Summary

CVECVE-2026-46101
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:32 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 bffef0acec9c3b837a785248a893137fb7f26c95 git Not specified
CNA Linux Linux affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 ca24f1243ad1a4d12d6a23876bbbe3ed02099853 git Not specified
CNA Linux Linux affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 6f820139d16a4c9865a145d4a9cf9c92cc632c14 git Not specified
CNA Linux Linux affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 f370205974f171a5868c13ff30d7642fed46e47b git Not specified
CNA Linux Linux affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 fe11e5c40817b84abaa5d83bfb6586d8412bfd07 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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