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CVE-2026-57589

Quick assessment

Affected
OpenBSD OpenBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 7.9及之前版本存在资源管理错误漏洞，该漏洞源于sys/kern/sysv_sem.c中tsleep后的上下文切换释放后重用，可能导致本地权限提升至root。

CVSS 7.4 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenBSD OpenBSD ≤ 7.9 affected
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I. Basic Information for CVE-2026-57589

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBSD 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 7.9及之前版本存在资源管理错误漏洞，该漏洞源于sys/kern/sysv_sem.c中tsleep后的上下文切换释放后重用，可能导致本地权限提升至root。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenBSD OpenBSD 0 ~ 7.9 -

II. Public POCs for CVE-2026-57589

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III. Intelligence Information for CVE-2026-57589

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Patches & Fixes for CVE-2026-57589 (1)

Security Blog Posts for CVE-2026-57589 (1)

IV. Related Vulnerabilities

Same product: OpenBSD
Same vendor: OpenBSD
Same weakness: CWE-416

V. Comments for CVE-2026-57589

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