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CVE-2026-52931

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in t…

Published Jun 24, 2026EPSS 0.40%

Overview

CVE-2026-52931 is a critical-severity vulnerability. It was published on June 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: tp_meter: avoid use of uninit sender vars

batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the

BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it

proceeds to read sender-only members that were never initialized, leading

to undefined behavior.

This can be triggered when a node that is currently acting as a receiver in

an ongoing tp_meter session receives a malicious ACK packet.

Guard against this by checking tp_vars->role immediately after the

lookup and bailing out if it is not BATADV_TP_SENDER, before any of

those members are accessed.

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/0e388af04b3958b178a1b979527f93eb46ea1feeRefgit.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4Refgit.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794bRefgit.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142Refgit.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3dRefgit.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91Refgit.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11Refgit.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52931?

CVE-2026-52931 is a critical-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-52931?

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-2026-52931?

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-2026-52931?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52931 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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