Use-after-free in FreeBSD - CVE-2026-58099
Published: September 30, 2026
Vulnerability identifier: #VU152949
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-58099
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to use-after-free in the kqueue copy-on-fork implementation when copying knotes to a child process during fork. A local user can trigger a race involving marker knotes to escalate privileges.
Affected software
FreeBSD
How to mitigate CVE-2026-58099
Install security update from vendor's website.