CVE-2026-57589

EUVD-2026-39156
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().
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
7.4 HIGH
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 2%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
openbsdopenbsd
𝑥
≤ 7.9
CNA
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d
https://openai.com/index/patch-the-planet/