#VU124442 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Linux kernel - CVE-2026-23393
Published: March 25, 2026
Vulnerability identifier: #VU124442
Vulnerability risk: Low
CVSSv4.0: 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-2026-23393
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the bridge CFM component when handling peer MEP deletion. A local user can trigger the deletion of a peer MEP, leading to a use-after-free condition if a delayed work item is rescheduled after cancellation but before memory is freed, resulting in a system crash.
The race condition occurs because br_cfm_frame_rx() runs in softirq context under RCU read lock and can re-schedule the delayed work between the cancellation and the memory release.
Remediation
Install security update from vendor's repository.