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CVE-2026-90408

wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event() PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event() There is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so the parse infrastructure does not enforce a minimum length for the event struct. Additionally, the num_vdevs field is taken directly from firmware and used as a loop bound over the vdev_ids array without checking that it fits within the TLV payload. Either condition can cause an out-of-bounds read. Add a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so the parse infrastructure enforces a minimum length for the fixed-size event struct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload length of a parsed TLV from the header preceding its data pointer. Use it in ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before the loop. Compile tested only.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected d889913205cf7ebda905b1e62c5867ed4e39f6c2 before d4aec20f3a84634171c139ab2e02bb2e5a5c756b; affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 before 24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5; affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 before 23bed4ef132c55c9016f0c6122c8b8ba2efa2353; affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 before bf97c9d5123859a07848462539153176db029f3a; affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 before 878654eb78c6aa0ff585baf1376567c775ca28ec
Linux / Linuxaffected 6.3; unaffected 0 before 6.3; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References