SB2026082637 - Information disclosure in FreeBSD hwpmc driver

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Main Vulnerability Database SB2026082637

SB2026082637 - Information disclosure in FreeBSD hwpmc driver

Published: August 26, 2026

Security Bulletin ID SB2026082637
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-58089)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References