CVE-2026-90408 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in ath12k_wmi_process_csa_switch_count_event caused by missing length checks on WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT event struct, letting attackers cause memory overreads, 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 ↗

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 ath12k WMI event length checks.

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

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