Improper access control in FreeBSD - CVE-2026-58086
Published: July 29, 2026 / Updated: July 30, 2026
Vulnerability identifier: #VU140490
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-58086
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to disable tracing or modify tracing flags.
The vulnerability exists due to improper access control in the ktrace(2) facility when validating privileged tracing state for processes in jails. A local user can modify or disable a jailed root user's ktrace(2) tracing configuration to disable tracing or modify tracing flags.
Exploitation is limited to a jail and requires permission to debug the target process.
How to mitigate CVE-2026-58086
Install security update from vendor's website.