wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_count_event()

Summary

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.

Timeline

1. Sep 17, 2026, 4:09 PM UTCCVE published
2. Oct 19, 2026, 9:03 AM UTCRecord last updated

Affected versions

• Linux Linux

  From d5c65159f2895379e11ca13f62feabe93278985d · fixed in f760b7d7e43584d2fa9bffcec1a04e502609f827; From d5c65159f2895379e11ca13f62feabe93278985d · fixed in d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce; From d5c65159f2895379e11ca13f62feabe93278985d · fixed in 0364926fb4bfb5b798e5fe2785b3023b4f767327; From d5c65159f2895379e11ca13f62feabe93278985d · fixed in 5de2b8c53714ad58f2fda118cd29ebbe31b38665; From d5c65159f2895379e11ca13f62feabe93278985d · fixed in 208d7fdb85976a737a715b81d54efaff6703880c

• Linux Linux

  5.6

• KernelLinux

  From 5.6.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 5