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CVE-2026-31659

9.8 · CRITICAL

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…

Published Apr 24, 2026EPSS 0.42%

Overview

CVE-2026-31659 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693faRefgit.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6Refgit.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062Refgit.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897Refgit.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3Refgit.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9Refgit.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10Refgit.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31659?

CVE-2026-31659 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31659?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31659?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31659?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31659 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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