{"id":"CVE-2026-52931","title":"batman-adv: tp_meter: avoid use of uninit sender vars","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: avoid use of uninit sender vars\n\nbatadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the\nBATADV_TP_SENDER role. When called wi…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 0e388af04b3958b178a1b979527f93eb46ea1fee","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 1a21c055f66e78973712a4a1be2a554f1ee2e4f4","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 9884c9c02d3c90e9215db3c5128f59045d20ae91","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 53f931e0146ae5bdab4cba302646827d06b3794b","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < ecdaa3e4d91040206afe21bc8a0d1198a0971ff3","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < dc2ae5fbd2dadc26735092f140b246841d969a11","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 85397e48afe6be83ffca5ad3f4792296bfc81d3d","Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 6c65cf23d4c6170fcf5714c32aa64689718cb142","Linux 4.8"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:22:56.523989Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:20.602Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52931","references":[{"url":"https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee"},{"url":"https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4"},{"url":"https://git.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91"},{"url":"https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b"},{"url":"https://git.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3"},{"url":"https://git.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11"},{"url":"https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d"},{"url":"https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142"}],"tags":["cve.org"],"epss":0.00399,"epssPercentile":0.32546,"ingestedAt":"2026-10-16T17:24:46.720Z","slug":"CVE-2026-52931","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: avoid use of uninit sender vars\n\nbatadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the\nBATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it\nproceeds to read sender-only members that were never initialized, leading\nto undefined behavior.\n\nThis can be triggered when a node that is currently acting as a receiver in\nan ongoing tp_meter session receives a malicious ACK packet.\n\nGuard against this by checking tp_vars->role immediately after the\nlookup and bailing out if it is not BATADV_TP_SENDER, before any of\nthose members are accessed.\n\n## Affected\n\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 0e388af04b3958b178a1b979527f93eb46ea1fee`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 1a21c055f66e78973712a4a1be2a554f1ee2e4f4`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 9884c9c02d3c90e9215db3c5128f59045d20ae91`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 53f931e0146ae5bdab4cba302646827d06b3794b`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < ecdaa3e4d91040206afe21bc8a0d1198a0971ff3`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < dc2ae5fbd2dadc26735092f140b246841d969a11`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 85397e48afe6be83ffca5ad3f4792296bfc81d3d`\n- `Linux >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e < 6c65cf23d4c6170fcf5714c32aa64689718cb142`\n- `Linux 4.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}