CVE-2026-58086: As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user…
CVE-2026-58086 · Severity: high · CVSS 8.1 · Published 2026-08-19
As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user. Tracing configured by a jailed root user was therefore not flagged as privileged.
An unprivileged user in a jail that has permission to debug the target process can modify the jailed root user's ktrace(2) flags, or disable tracing outright. A jailed root user therefore cannot reliably trace unprivileged processes.
No. Junglewise Threat Intelligence has no report of CVE-2026-58086 being exploited in the wild.
How severe is CVE-2026-58086?
High severity, with a CVSS score of 8.1, published 19 August 2026.
Which products and versions are affected?
Freebsd. The advisory does not name versions.
Is there a fix for CVE-2026-58086?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-58086?
Check whether you run Freebsd. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.