{"id":"CVE-2026-74554","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74554","summary":"wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()","details":"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 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","published":"2026-08-15T12:28:00.097Z","modified":"2026-08-18T03:56:51.583076110Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"7.1.8"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74554.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74554"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:51.583076110Z"}}