CVE-2026-57589CWE-416

sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root

High · published June 25, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
6.0
In the wild
Unconfirmed
What it is

sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00169 · 6.0th percentile
Weakness
CWE-416 · Use After Free
Published
2026-06-25T00:33Z
EPSS history
Timeline
  • 25 JUN 00:33Z
    sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root
    cvelistv5