CVE-2026-58086

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Freebsd

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-273CWE-273

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	15.0, 15.1	—

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