SB2025102603 - Improper locking in Linux kernel trace
Published: October 26, 2025
Security Bulletin ID
SB2025102603
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper locking (CVE-ID: CVE-2025-40021)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the dyn_event_open() function in kernel/trace/trace_dynevent.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/07b1f63b5f86765793fab44d3d4c2be681cddafb
- https://git.kernel.org/stable/c/0d41604d2d53c1abe27fefb54b37a8f6642a4d74
- https://git.kernel.org/stable/c/3887f3814c0e770e6b73567fe0f83a2c01a6470c
- https://git.kernel.org/stable/c/456c32e3c4316654f95f9d49c12cbecfb77d5660
- https://git.kernel.org/stable/c/573b1e39edfcb7b4eecde0f1664455a1f4462eee
- https://git.kernel.org/stable/c/b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb
- https://git.kernel.org/stable/c/f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf