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: 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

Timeline

1. Aug 15, 2026, 12:28 PM UTCCVE published
2. Oct 16, 2026, 6:59 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 7:05 PM UTCRecord last updated

Affected versions

• Linux Linux

  From ee16dcf573d5e3283fda601dd4bca6bc52251017 · fixed in 234b5cb81e6fcc1e3b31b13deff66130be55f36e; From ee16dcf573d5e3283fda601dd4bca6bc52251017 · fixed in 47abd2ca281531deee38a3b3770d885e270e9fc9

• Linux Linux

  7.0

• KernelLinux

  From 7.0.0 · fixed in 7.1.8

References 2