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().
Published: 2026-06-25
Score: 7.4 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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History

Thu, 25 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 25 Jun 2026 02:15:00 +0000

Type Values Removed Values Added
Title OpenBSD Kernel Use‑After‑Free Enables Local Privilege Escalation

Thu, 25 Jun 2026 00:45:00 +0000

Type Values Removed Values Added
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().
First Time appeared Openbsd
Openbsd openbsd
Weaknesses CWE-416
CPEs cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
Vendors & Products Openbsd
Openbsd openbsd
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Subscriptions

Openbsd Openbsd
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-26T03:55:33.978Z

Reserved: 2026-06-25T00:33:04.330Z

Link: CVE-2026-57589

cve-icon Vulnrichment

Updated: 2026-06-25T12:35:08.527Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T05:45:02Z

Weaknesses