{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74554","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.916Z","datePublished":"2026-08-15T12:28:00.097Z","dateUpdated":"2026-08-17T05:48:37.563Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:48:37.563Z"},"descriptions":[{"lang":"en","value":"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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The bug is in ath12k WiFi 7 MLO peer cleanup during firmware crash recovery; an adjacent attacker associates as an MLO client (or runs a malicious MLO AP) over 802.11, creating dp_peers whose peer_id includes BIT(13), then firmware recovery invokes ath12k_mac_dp_peer_cleanup().\nAC:L - Once an MLO peer exists, recovery deterministically calls clear_bit() with index >=0x2000 on every cleanup; the attacker controls association and can repeatedly induce or wait for firmware crash/recovery (MHI RDDM) without depending on uncontrollable timing or layout.\nPR:N - Exploitation requires only wireless association and firmware recovery on a host running ath12k; the remote attacker needs no local account, shell access, or Linux capabilities on the victim system.\nUI:N - On an ath12k AP the vulnerable recovery path runs without any action by the device operator beyond normal AP operation; the attacker triggers the condition solely by wireless association and crash/recovery events.\nS:U - The out-of-bounds clear_bit corrupts kernel memory in ath12k_hw/dp_hw adjacent to free_ml_peer_id_map; impact stays within kernel/driver context and does not by itself cross VM, container, or IOMMU security boundaries.\nC:H - clear_bit() with peer_id>=0x2000 writes outside the 256-bit free_ml_peer_id_map into the adjacent dp_peers[] RCU pointer table, corrupting kernel pointers that can be dereferenced later for arbitrary kernel memory read primitives.\nI:H - The out-of-bounds atomic bit-clear is a kernel memory write that corrupts dp_peers[] entries used on datapath RX/TX, enabling control of freed/corrupted objects and potential arbitrary code execution, not merely a benign crash.\nA:H - Corrupted dp_peers pointers during recovery can cause kernel oops/panic on subsequent datapath use, and the bitmap slot is never freed so ath12k_peer_ml_alloc() exhausts MLO peer IDs, denying further MLO associations (DoS)."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/mac.c"],"versions":[{"version":"ee16dcf573d5e3283fda601dd4bca6bc52251017","lessThan":"234b5cb81e6fcc1e3b31b13deff66130be55f36e","status":"affected","versionType":"git"},{"version":"ee16dcf573d5e3283fda601dd4bca6bc52251017","lessThan":"47abd2ca281531deee38a3b3770d885e270e9fc9","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/mac.c"],"versions":[{"version":"7.0","status":"affected"},{"version":"0","lessThan":"7.0","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"},{"url":"https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"}],"title":"wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()","x_generator":{"engine":"bippy-1.2.0"}}}}