Improper locking in Linux kernel - CVE-2026-53326
Published: July 2, 2026
Vulnerability identifier: #VU136720
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53326
CWE-ID: CWE-667
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 lock handling in debugobjects pool refill logic in lib/debugobjects.c when handling hard interrupts during early boot on PREEMPT_RT kernels. A local user can trigger an interrupt in a context that holds a lock required by the allocation path to cause a denial of service.
Exploitation requires a debug PREEMPT_RT kernel on an ARM64 system during the early boot window before scheduling is enabled.
How to mitigate CVE-2026-53326
Install security update from vendor's repository.