OpenBSD 存在一个释放后重用漏洞，允许本地用户提权至 root 权限。

OpenBSD 存在一个释放后重用漏洞，允许本地用户提权至 root 权限。
OpenBSD has a use-after-free allowing local privilege escalation to root

原始链接: https://nvd.nist.gov/vuln/detail/cve-2026-57589

**CVE-2026-57589 摘要** OpenBSD 7.9 及之前版本中发现了一个严重安全漏洞。该缺陷被归类为“释放后重用”（Use-After-Free，CWE-416），存在于 `sys/kern/sysv_sem.c` 文件中。具体而言，在 `sys_semget()` 函数的 `tsleep` 调用之后会出现上下文切换引发的释放后重用问题。此漏洞风险极大，因为它允许本地提权，可能使攻击者获得系统的 root 级访问权限。CISA 已将该漏洞的技术严重程度评估为“完全（total）”。建议用户查看 OpenBSD 官方存储库以获取针对此问题的补丁。

Hacker News | 最新 | 过往 | 评论 | 提问 | 展示 | 招聘 | 提交 | 登录 OpenBSD 存在一个允许本地提权至 root 的释放后使用（use-after-free）漏洞 (nist.gov) 25 分，linggen 发布于 1 小时前 | 隐藏 | 过往 | 收藏 | 3 条评论帮助 Tiberium 4 分钟前 | 下一条 [–] 这似乎是“Patch The Planet” [0] 项目的一部分，该项目本质上是 OpenAI 提供模型访问权限，由 Trail of Bits 利用这些模型来发现开源项目中的漏洞。 [0] https://openai.com/index/patch-the-planet/ 回复 uticus 0 分钟前 | 上一条 | 下一条 [–] > 默认安装中仅有两个远程漏洞，这在很长一段时间内都是罕见的！ https://www.openbsd.org/ https://en.wikipedia.org/wiki/OpenBSD#Security_record 回复 iberator 4 分钟前 | 上一条 | 下一条 [–] 亵渎回复指南 | 常见问题 | 列表 | API | 安全 | 法律 | 加入 YC | 联系搜索：

Awaiting Enrichment

This CVE record has been marked for NVD enrichment efforts.

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().

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

CVSS 3.x Severity and Vector Strings:

CVSS 2.0 Severity and Vector Strings:

References to Advisories, Solutions, and Tools

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Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	MITRE

Change History

3 change records found show changes

CVE Modified by CISA-ADP 6/26/2026 1:16:31 AM

Action	Type	Old Value	New Value
Changed	SSVC	{"timestamp":"2026-06-25T12:34:51.474289Z","id":"CVE-2026-57589","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}	{"timestamp":"2026-06-25T00:00:00+00:00","id":"CVE-2026-57589","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

Action

Type

Old Value

New Value

Changed

SSVC

{"timestamp":"2026-06-25T12:34:51.474289Z","id":"CVE-2026-57589","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

{"timestamp":"2026-06-25T00:00:00+00:00","id":"CVE-2026-57589","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by CISA-ADP 6/25/2026 9:16:49 AM

Action	Type	Old Value	New Value
Added	SSVC		{"timestamp":"2026-06-25T12:34:51.474289Z","id":"CVE-2026-57589","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

New CVE Received from MITRE 6/24/2026 9:16:26 PM

Action	Type	New Value
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().
Added	CVSS V3.1	AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-416
Added	Reference	https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d
Added	Reference	https://openai.com/index/patch-the-planet/
Added	Affected	[{"vendor":"OpenBSD","product":"OpenBSD","defaultStatus":"unaffected","versions":[{"version":"0","lessThanOrEqual":"7.9","versionType":"custom","status":"affected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-57589
NVD Published Date:
06/24/2026
NVD Last Modified:
06/26/2026
Source:
MITRE