CVE-2026-90407wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_count_event()

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: fix overreads in ath11k_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 ath11k_wmi_tlv_data_len() to recover the payload length of a parsed TLV from the header preceding its data pointer. Use it in ath11k_wmi_process_csa_switch_count_event() to bound num_vdevs before the loop. Compile tested only.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/57e77a6d900e5bc6e73ccd3ee1ba3bce834c9dde
• https://git.kernel.org/stable/c/f760b7d7e43584d2fa9bffcec1a04e502609f827
• https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce
• https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327
• https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665
• https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c