Improper resource shutdown or release in Linux kernel - CVE-2026-64426
Published: July 27, 2026
Vulnerability identifier: #VU139521
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64426
CWE-ID: CWE-404
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper resource shutdown or release in io_uring NOP handling when processing a NOP request with IOSQE_FIXED_FILE set without IORING_NOP_FIXED_FILE. A local user can submit a crafted io_uring NOP request to cause a denial of service.
The issue results in a file reference leak because a normally acquired file reference is not released on completion.
Affected software
Linux kernel
How to mitigate CVE-2026-64426
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3