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CVE-2026-53211

5.5 · MEDIUM

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 registe…

Published Jun 25, 2026CWE-401EPSS 0.12%

Overview

CVE-2026-53211 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995Refgit.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677Refgit.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53211?

CVE-2026-53211 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53211?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53211?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53211?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53211 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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