Use of Uninitialized Variable in Linux kernel - CVE-2026-53311
Published: June 29, 2026
Vulnerability identifier: #VU135723
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-2026-53311
CWE-ID: CWE-457
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 use of uninitialized memory in fuse_dentry_revalidate() when handling dentry revalidation during file open operations. A local user can trigger file open paths involving a dentry with an uninitialized d_time value to cause a denial of service.
The issue was identified by KMSAN and occurs when a dentry allocated by __d_alloc() is revalidated before d_time is initialized.
How to mitigate CVE-2026-53311
Install security update from vendor's repository.