Use-after-free in Linux kernel - CVE-2026-64001
Published: July 20, 2026
Vulnerability identifier: #VU138653
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64001
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in snd_pcm_oss_proc_write() and snd_pcm_oss_look_for_setup() when handling proc writes followed by a later OSS device open. A local user can trigger a proc write error that leaves a stale setup_list entry and then open an OSS device to dereference freed memory to cause a denial of service.
The issue arises because a newly allocated setup entry may be linked into setup_list before task name allocation completes.
How to mitigate CVE-2026-64001
Install security update from vendor's repository.