CVE-2026-58086

ktrace(2) privilege incorrectly validated in jails

State: Published
Severity: 8.1 High
Published: Aug 19, 2026
Updated: Aug 27, 2026
Reserved: Jun 29, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	CISA-ADP

Weaknesses

CWE-273 Improper Check for Dropped Privileges

Affected Products

Product	Versions
FreeBSDFreeBSD	15.1-RELEASE to before p2Affected 15.0-RELEASE to before p12Affected

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.ascvendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.