{"id":"CVE-2026-74554","title":"wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= ee16dcf573d5e3283fda601dd4bca6bc52251017 < 234b5cb81e6fcc1e3b31b13deff66130be55f36e","Linux >= ee16dcf573d5e3283fda601dd4bca6bc52251017 < 47abd2ca281531deee38a3b3770d885e270e9fc9","Linux 7.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:59:58.796220Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:55.415Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74554","references":[{"url":"https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"},{"url":"https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"}],"tags":["cve.org"],"epss":0.0034,"epssPercentile":0.25943,"ingestedAt":"2026-10-16T19:46:24.344Z","slug":"CVE-2026-74554","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is\nwrong: dp_peer->peer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta->ml_peer_id. Use that instead.\n\nWhile there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta->ml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3\n\n## Affected\n\n- `Linux >= ee16dcf573d5e3283fda601dd4bca6bc52251017 < 234b5cb81e6fcc1e3b31b13deff66130be55f36e`\n- `Linux >= ee16dcf573d5e3283fda601dd4bca6bc52251017 < 47abd2ca281531deee38a3b3770d885e270e9fc9`\n- `Linux 7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}