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 ↗

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

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