# wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_count_event()

CVE record · `CVE-2026-90407`

- **Identifiers:** `CVE-2026-90407`
- **State:** Confirmed
- **Severity:** CVSS 7.7 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before 57e77a6d900e5bc6e73ccd3ee1ba3bce834c9dde` (git)
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before f760b7d7e43584d2fa9bffcec1a04e502609f827` (git)
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce` (git)
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before 0364926fb4bfb5b798e5fe2785b3023b4f767327` (git)
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before 5de2b8c53714ad58f2fda118cd29ebbe31b38665` (git)
  - affected: `d5c65159f2895379e11ca13f62feabe93278985d to before 208d7fdb85976a737a715b81d54efaff6703880c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel versions from 5.6 onward that include the ath11k wireless driver can read past the end of a buffer when processing a channel switch count event from firmware. The source gives few details on what an attacker needs to trigger this. Upgrade to 6.1.191, 6.6.157, 6.12.110, or 6.18.52 or later in the matching series.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.7 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90407](https://www.cve.org/CVERecord?id=CVE-2026-90407)
- [NVD: CVE-2026-90407](https://nvd.nist.gov/vuln/detail/CVE-2026-90407)

### References from the CNA

- <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>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-90407>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90407/>. Everything for agents: <https://agentprime.io/llms.txt>.