CVE-2026-57589 PUBLISHED

Assigner: mitre
Reserved: 25.06.2026 Published: 25.06.2026 Updated: 25.06.2026

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().

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 7.4

Attack Vector	Local	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	OpenBSD
Product	OpenBSD
Versions	Default: unaffected affected from 0 to 7.9 (incl.)

References

https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d
https://openai.com/index/patch-the-planet/

Problem Types

CWE-416 Use After Free CWE