Improper locking in Linux kernel - CVE-2026-53327
Published: July 2, 2026
Vulnerability identifier: #VU136725
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-53327
CWE-ID: CWE-667
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 lock state handling in debugobjects fill_pool logic in lib/debugobjects.c when refilling the debug object pool on RT-enabled kernels while the current task is blocked on an rt_mutex. A local user can trigger the vulnerable code path to cause a denial of service.
Only RT-enabled kernel configurations are affected.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-53327
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.95-1
linux (Debian package) - update to 6.12.95-1