netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register

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Summary

CVECVE-2026-53211
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:38 UTC
Updated2026-06-25 09:16:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register NFT_META_BRI_IIFHWADDR declares its destination register with len = ETH_ALEN (6 bytes), which the register-init tracking rounds up to two 32-bit registers (8 bytes). nft_meta_bridge_get_eval() then does memcpy(dest, br_dev->dev_addr, ETH_ALEN), writing only 6 bytes and leaving the upper 2 bytes of the second register as uninitialised nft_do_chain() stack. A downstream load of that register span leaks those stale bytes to userspace. Zero the second register before the memcpy so the full declared span is written.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cbd2257dc96e3e46217540fcb095a757ffa20d96 07acb9798477535933bd658ac9fa85b6cb10d995 git Not specified
CNA Linux Linux affected cbd2257dc96e3e46217540fcb095a757ffa20d96 f1e81d571e375d10e50e852223593493d98c1bac git Not specified
CNA Linux Linux affected cbd2257dc96e3e46217540fcb095a757ffa20d96 c7d573551f9286100a055ef696cde6af54549677 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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