CVE-2026-90407

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.

Affected Software

Weaknesses

References

• 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

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