Improper access control in FreeBSD - CVE-2026-58089
Published: August 26, 2026
Vulnerability identifier: #VU145750
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-58089
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to monitor a process after it executes a setuid or setgid binary.
The vulnerability exists due to improper access control in hwpmc(4) during exec credential transitions when executing a setuid or setgid image with attached PMCs. A local user can attach PMCs to a process before an execve transition to monitor a process after it executes a setuid or setgid binary.
Only systems that use hwpmc(4) are affected.
Affected software
FreeBSD
How to mitigate CVE-2026-58089
Install security update from vendor's website.