CVE-2026-53211 (GCVE-0-2026-53211)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cbd2257dc96e3e46217540fcb095a757ffa20d96 , < 07acb9798477535933bd658ac9fa85b6cb10d995 (git)
Affected: cbd2257dc96e3e46217540fcb095a757ffa20d96 , < f1e81d571e375d10e50e852223593493d98c1bac (git)
Affected: cbd2257dc96e3e46217540fcb095a757ffa20d96 , < c7d573551f9286100a055ef696cde6af54549677 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "cve": "CVE-2026-53211",
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      "product_status:known_affected": "76",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53211.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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