by Kastro
Paper/Archive/CVE-2026-52931

CVE-2026-52931

Linux Linux — batman-adv: tp_meter: avoid use of uninit sender vars

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 42.7.427 × 208.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 0e388af04b3958b178a1b979527f93eb46ea1fee0e388af04b3958b178a1b979527f93eb46ea1feeCNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 1a21c055f66e78973712a4a1be2a554f1ee2e4f41a21c055f66e78973712a4a1be2a554f1ee2e4f4CNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 9884c9c02d3c90e9215db3c5128f59045d20ae919884c9c02d3c90e9215db3c5128f59045d20ae91CNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 53f931e0146ae5bdab4cba302646827d06b3794b53f931e0146ae5bdab4cba302646827d06b3794bCNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < ecdaa3e4d91040206afe21bc8a0d1198a0971ff3ecdaa3e4d91040206afe21bc8a0d1198a0971ff3CNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < dc2ae5fbd2dadc26735092f140b246841d969a11dc2ae5fbd2dadc26735092f140b246841d969a11CNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 85397e48afe6be83ffca5ad3f4792296bfc81d3d85397e48afe6be83ffca5ad3f4792296bfc81d3dCNA
Linux33a3bb4a3345bb511f9c69c913da95d4693e2a4e – < 6c65cf23d4c6170fcf5714c32aa64689718cb1426c65cf23d4c6170fcf5714c32aa64689718cb142CNA
Linux4.8–CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1feerefgit.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4refgit.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91refgit.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794brefgit.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3refgit.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11refgit.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3drefgit.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142