Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995
- https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677
- https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac
FAQ
What is CVE-2026-53211?
CVE-2026-53211 is a documented vulnerability. 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 w...
How severe is CVE-2026-53211?
CVSS scoring is not yet available for CVE-2026-53211. Check NVD for updates.
Is there a patch for CVE-2026-53211?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.