Privilege escalation in Freebsd
CVE-2026-45256
When used to deliver a signal to a specific thread, thr_kill2(2) called p_cansignal() to determine whether the operation was permitted but did not check the result before delivering the signal. The signal was sent even when the permission…
Vulnerability class: Privilege Escalation
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:N/I:N/A:H.
Affected products
- Freebsd — versions 14.3, 15.0, 14.4-RELEASE
Weakness classification (CWE)
References
- secteam@freebsd.org (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45256?
- CVE-2026-45256 is a medium-severity vulnerability in Freebsd, classified under Improper Privilege Management. CVSS score: 5.5/10. Published 2026-06-26.
- How severe is CVE-2026-45256?
- Medium severity. CVSS v3 base score is 5.5 out of 10.