CVE-2026-52931

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.

CVSS 3.1

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

EPSS

0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-25)

CWE

CWE-457

Published

2026-06-24

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee
• https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4
• https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b
• https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142
• https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d

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