---
id: CVE-2026-58089
title: >-
  When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4)
  is supposed to detach PMCs owned by unprivileged processes
summary: >-
  When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4)
  is supposed to detach PMCs owned by unprivileged processes.  An inverted check
  meant that this scenario was not handled properly.


  An unprivileged local user wh…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-273
vendor: freebsd
product: freebsd
affected:
  - freebsd = 14.4
  - freebsd = 15.0
  - freebsd = 15.1
published: '2026-08-26'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T14:06:22.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-58089'
references:
  - url: 'https://security.freebsd.org/advisories/FreeBSD-SA-26:56.hwpmc.asc'
    label: secteam@freebsd.org
tags:
  - nvd
epss: 0.00119
epssPercentile: 0.02021
ingestedAt: '2026-09-24T14:44:21.305Z'
---

## Overview

When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes.  An inverted check meant that this scenario was not handled properly.

An unprivileged local user who has attached PMCs to a process can continue monitoring it after the process executes a setuid or setgid binary, contrary to the intended policy.

## Affected

- `freebsd = 14.4`
- `freebsd = 15.0`
- `freebsd = 15.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.