CRITICAL: CVE-2026-31659 (CVSS 9.8) — multiple products

CVE: CVE-2026-31659

CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

_See vendor advisory_

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.

Verified Sources

References

https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa
https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6
https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062
https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897
https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3
https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9
https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10
https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._

Lyrie Verdict

A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.

#critical