wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()

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Summary

CVECVE-2026-74554
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:00 UTC
Updated2026-08-15 13:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup() ath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the free_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is wrong: dp_peer->peer_id for an MLO peer always carries the ATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with index >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS (256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The intended bitmap entry also never gets cleared, so subsequent ath12k_peer_ml_alloc() calls eventually run out of IDs. The ID without the VALID bit is what ath12k_peer_ml_alloc() returned and is stored in ahsta->ml_peer_id. Use that instead. While there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so the bitmap and ahsta->ml_peer_id stay in sync. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ee16dcf573d5e3283fda601dd4bca6bc52251017 234b5cb81e6fcc1e3b31b13deff66130be55f36e git Not specified
CNA Linux Linux affected ee16dcf573d5e3283fda601dd4bca6bc52251017 47abd2ca281531deee38a3b3770d885e270e9fc9 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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