---
title: "CVE-2026-90407: Linux Kernel - Out of Bounds Read"
description: "Linux kernel contains a buffer overread in ath11k_wmi_process_csa_switch_count_event caused by missing length checks on WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT event struct and unchecked num_vdevs field, letting attackers cause out-of-bounds reads, exploit requires crafted firmware event."
url: https://panop.io/threat-heartbeat/CVE-2026-90407/
---

# CVE-2026-90407 Linux Kernel - Out of Bounds Read

Linux kernel contains a buffer overread in ath11k\_wmi\_process\_csa\_switch\_count\_event caused by missing length checks on WMI\_TAG\_PDEV\_CSA\_SWITCH\_COUNT\_STATUS\_EVENT event struct and unchecked num\_vdevs field, letting attackers cause out-of-bounds reads, exploit requires crafted firmware event.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90407)

## Details

Type

Out of Bounds Read

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for ath11k\_wmi\_process\_csa\_switch\_count\_event.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90407](https://nvd.nist.gov/vuln/detail/CVE-2026-90407)
- [https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327](https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327)
- [https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c](https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c)
- [https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665](https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665)
- [https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce](https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce)
- [https://git.kernel.org/stable/c/f760b7d7e43584d2fa9bffcec1a04e502609f827](https://git.kernel.org/stable/c/f760b7d7e43584d2fa9bffcec1a04e502609f827)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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