SB20260816169 - Out-of-bounds write in Linux kernel ath ath12k driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-74554)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in ath12k_mac_dp_peer_cleanup() when cleaning up MLO peers. A local user can trigger peer cleanup with a crafted peer_id value carrying the ATH12K_PEER_ML_ID_VALID bit to cause a denial of service.

The issue affects the ML peer ID bitmap handling and can corrupt memory adjacent to ah->free_ml_peer_id_map; the intended bitmap entry is also not cleared, which can exhaust available IDs for subsequent allocations.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e
• https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9