Improper Synchronization in Linux kernel - CVE-2026-23374
Published: March 25, 2026
Vulnerability identifier: #VU124459
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-2026-23374
CWE-ID: CWE-662
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 or potentially execute arbitrary code.
The vulnerability exists due to improper synchronization in the blktrace component when handling block I/O tracing operations. A local user can trigger a use of __this_cpu_read/write in a preemptible context to cause a kernel BUG and system crash.
The issue arises in process context where preemption is enabled, violating the requirement for preemption to be disabled when accessing per-CPU variables via __this_cpu_read/write. This can lead to undefined behavior including memory corruption.
How to mitigate CVE-2026-23374
Install security update from vendor's repository.