CVE-2026-52931

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 0e388af04b3958b178a1b979527f93eb46ea1feeaffected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 1a21c055f66e78973712a4a1be2a554f1ee2e4f4affected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 9884c9c02d3c90e9215db3c5128f59045d20ae91affected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 53f931e0146ae5bdab4cba302646827d06b3794baffected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < ecdaa3e4d91040206afe21bc8a0d1198a0971ff3affected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < dc2ae5fbd2dadc26735092f140b246841d969a11affected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 85397e48afe6be83ffca5ad3f4792296bfc81d3daffected
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 6c65cf23d4c6170fcf5714c32aa64689718cb142affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References