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🛡️ CVE-2026-31659 — kernel

🔴 CVSS 9.8 — Critical ✅ No Known Exploit NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

batman-adv: reject oversized global TT response buffers

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-31659 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.13)
  • linux-kernel

Timeline and source

Published on 24 April 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31659 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Critical
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-24
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.13
linux-kernel — —

References

Similar Threats

Exploit Protection

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CVE-2026-31659 carries CVSS 9.8 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.