CVE-2026-53211

Summary

In 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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995
• https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac
• https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677

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