SB20260812170 - Use-after-free in Linux kernel ath ath9k driver

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Main Vulnerability Database SB20260812170

SB20260812170 - Use-after-free in Linux kernel ath ath9k driver

Published: August 12, 2026

Security Bulletin ID SB20260812170
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-68363)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in ath9k_hif_request_firmware() in drivers/net/wireless/ath/ath9k/hif_usb.c when handling a failed asynchronous firmware request during concurrent USB device disconnect. A local user can trigger a firmware download failure and a concurrent disconnect to cause a denial of service.

The issue is triggered by a race condition between the firmware callback running on the events workqueue and device disconnect, leading to a read from freed memory.


Remediation

Install update from vendor's website.

References