PT-2026-52158 · Openbsd · Openbsd

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-57589

Mitre

CVSS v3.1

7.4

High

Base vector

AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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().

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-57589

Affected Products

Openbsd

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-57589 · Security Note
• https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d · Note
• https://openai.com/index/patch-the-planet · Note