CVE-2026-74554

Technical Description

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-

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References