Vulnerability in FreeBSD
CVE-2026-58084
To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace. An unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (3.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- FreeBSD — versions 15.0, 15.1
Weakness classification (CWE)
References
- security.freebsd.org/advisories/FreeBSD-SA-26:51.ktimer.asc (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-58084?
- CVE-2026-58084 is a medium-severity vulnerability in FreeBSD, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2026-08-19.
- How severe is CVE-2026-58084?
- Medium severity. CVSS v3 base score is 5.5 out of 10.