wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()
CVE-2026-90408 · published 17 Sept 2026
How serious is it
- Severity: high, CVSS score 7.7 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-90408?
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Who is affected
- Linux Linux: d889913205cf7ebda905b1e62c5867ed4e39f6c2 to < d4aec20f3a84634171c139ab2e02bb2e5a5c756b, d889913205cf7ebda905b1e62c5867ed4e39f6c2 to < 24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5, d889913205cf7ebda905b1e62c5867ed4e39f6c2 to < 23bed4ef132c55c9016f0c6122c8b8ba2efa2353, d889913205cf7ebda905b1e62c5867ed4e39f6c2 to < bf97c9d5123859a07848462539153176db029f3a
- Linux Linux: 6.3
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
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References
- git.kernel.org/stable/c/d4aec20f3a84634171c139ab2e02bb2e5a5c756b
- git.kernel.org/stable/c/24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5
- git.kernel.org/stable/c/23bed4ef132c55c9016f0c6122c8b8ba2efa2353
- git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a
- git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON