---
id: CVE-2026-53211
title: |-
  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 t…
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 t…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-401
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.18, < 6.18.36'
  - 'linux_kernel >= 6.19, < 7.0.13'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.13
published: '2026-06-25'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53211'
references:
  - url: 'https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00121
epssPercentile: 0.01658
ingestedAt: '2026-07-03T13:02:28.036Z'
---

## Overview

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

- `linux_kernel >= 6.18, < 6.18.36`
- `linux_kernel >= 6.19, < 7.0.13`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.13`