SB20260828153 - Use-after-free in Linux kernel char driver
Published: August 28, 2026
Security Bulletin ID
SB20260828153
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-80622)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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 a use-after-free in tlclk_cleanup() in the tlclk driver when cleaning up the device while user-space processes are still interacting with it. A local user can keep the device in use during module cleanup to cause a denial of service.
The issue is associated with blocked readers in the wait queue and concurrent timer activity during cleanup.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a
- https://git.kernel.org/stable/c/166dd1d5265e067459e674c11688919901813ec2
- https://git.kernel.org/stable/c/3d5e4cc0d9dce79b0429da3134ac7b072ab9009f
- https://git.kernel.org/stable/c/42223445607a9a5df3cb1c4729abfe3a5085e7ce
- https://git.kernel.org/stable/c/764723bd67a6c8f53a8d8309211fb039e2ebcf49
- https://git.kernel.org/stable/c/96902299a22d126ef5eb3f45cd5d8ceea9e6a735
- https://git.kernel.org/stable/c/bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1
- https://git.kernel.org/stable/c/c3f0cd76561ae611c2d247ee96dfd559e4197cb7