CVE-2026-52931
CRITICAL 9.8In 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.
Severe if exploited (CVSS 9.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 32nd percentile
Impact if exploited
9.8CVSS 3.1 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Weakness (CWE)
Not classified.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Technical & other
- https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee
- https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4
- https://git.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91
- https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b
- https://git.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3
- https://git.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11
- https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d
- https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142