Vulnerability in FreeBSD

CVE-2026-58089

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (2.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-58089: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

  • FreeBSD — versions 15.0, 14.4, 15.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-58089?
CVE-2026-58089 is a high-severity vulnerability in FreeBSD, classified under Improper Check for Dropped Privileges. CVSS score: 7.8/10. Published 2026-08-26.
How severe is CVE-2026-58089?
High severity. CVSS v3 base score is 7.8 out of 10.