Improper control of a resource through its lifetime in Linux kernel - CVE-2026-53373
Published: July 21, 2026
Vulnerability identifier: #VU138888
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-2026-53373
CWE-ID: CWE-664
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 improper resource management in mmap_action_complete() and VMA cleanup handling when processing mmap_prepare() actions invoked from mmap() compatibility paths. A local user can trigger an error during a crafted mmap operation to cause a denial of service.
The issue occurs when a not-fully-established detached VMA is handled through stacked drivers or file systems such as overlayfs or shm.
How to mitigate CVE-2026-53373
Install security update from vendor's repository.