CVE-2026-57589

Published: Jun 25, 2026Modified: Jul 10, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

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().

Affected (1)

Products: Openbsd: Openbsd

Openbsd

1 product

Openbsd

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Openbsd Openbsd	Up to 7.9

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (2)

https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d

Source: cve@mitre.org

Patch

https://openai.com/index/patch-the-planet/

Source: cve@mitre.org

Third Party Advisory

Timeline

No history available yet.