CVE-2026-31659 (GCVE-0-2026-31659)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-04-27 14:04
VLAI?
Title
batman-adv: reject oversized global TT response buffers
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject oversized global TT response buffers batadv_tt_prepare_tvlv_global_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the TT payload length plus the VLAN header offset can exceed 65535 and wrap before kmalloc(). The full-table response path still uses the original TT payload length when it fills tt_change, so the wrapped allocation is too small and batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object before the later packet-size check runs. Fix this by rejecting TT responses whose TVLV value length cannot fit in the 16-bit TVLV payload length field.
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < 7e5d007e0df946bffb8542fb112e0044014a5897 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < 2997f4bd1f982e7013709946e00be89b507693fa (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < 95c71365a2222908441b54d6f2c315e0c79fcec3 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < 69d61639bc7e963c3b645e570279d731e7c89062 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < f970646b9a39539d1bac86822ac78b5915455ea9 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < de6c1dc3c7d01a152607e6fcecee4d5288283f10 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < cf2199171ef799ca7270019125f4a91bd20ad4d9 (git)
Affected: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b , < 3a359bf5c61d52e7f09754108309d637532164a6 (git)
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    Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.135 , ≤ 6.6.* (semver)
Unaffected: 6.12.82 , ≤ 6.12.* (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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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.

Sightings

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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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Detection rules are retrieved from Rulezet.