CVE-2026-57589

OpenBSD Kernel Use‑After‑Free Enables Local Privilege Escalation

Published Jun 25, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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().

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jun 26, 2026, 3:55 AM
Reserved
Jun 25, 2026, 12:33 AM
Status
Analyzed
Published
Jun 25, 2026, 1:16 AM
Modified
Jul 10, 2026, 4:39 PM