Use of Uninitialized Variable in FreeBSD - CVE-2026-58084
Published: July 29, 2026 / Updated: July 30, 2026
Vulnerability identifier: #VU140492
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-58084
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper initialization in realtimer_gettime() when returning the previous timer value for a POSIX timer using CLOCK_TAI through timer_settime(2). A local user can create a POSIX timer with CLOCK_TAI and call timer_settime(2) with a non-NULL old_value argument to disclose sensitive information.
The issue occurs when no TAI offset has been configured.
How to mitigate CVE-2026-58084
Install security update from vendor's website.