CVE-2026-58086

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.

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-26)

CWE

CWE-273

Published

2026-08-19

Modified

2026-10-27

Record from

the NVD, synced 2026-10-27

Affected

• freebsd:freebsd

References

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

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