Vulnerability-Lookup

CNVD-2026-26371

Vulnerability from cnvd - Published: 2026-07-03

Title

OpenBSD资源管理错误漏洞（CNVD-2026-26371）

Description

OpenBSD是一款类Unix操作系统，注重安全性和代码质量。 OpenBSD存在资源管理错误漏洞。该漏洞源于sys/kern/sysv_sem.c中sys_semget()函数在tsleep后因上下文切换导致内存错误引用，攻击者可利用该漏洞通过本地权限提升至root。

Severity

中

Patch Name

OpenBSD资源管理错误漏洞（CNVD-2026-26371）的补丁

Patch Description

OpenBSD是一款类Unix操作系统，注重安全性和代码质量。 OpenBSD存在资源管理错误漏洞。该漏洞源于sys/kern/sysv_sem.c中sys_semget()函数在tsleep后因上下文切换导致内存错误引用，攻击者可利用该漏洞通过本地权限提升至root。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-57589

Impacted products

Name
Openbsd OpenBSD <=7.9

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-57589",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-57589"
    }
  },
  "description": "OpenBSD\u662f\u4e00\u6b3e\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\uff0c\u6ce8\u91cd\u5b89\u5168\u6027\u548c\u4ee3\u7801\u8d28\u91cf\u3002\n\nOpenBSD\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8esys/kern/sysv_sem.c\u4e2dsys_semget()\u51fd\u6570\u5728tsleep\u540e\u56e0\u4e0a\u4e0b\u6587\u5207\u6362\u5bfc\u81f4\u5185\u5b58\u9519\u8bef\u5f15\u7528\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u672c\u5730\u6743\u9650\u63d0\u5347\u81f3root\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-26371",
  "openTime": "2026-07-03",
  "patchDescription": "OpenBSD\u662f\u4e00\u6b3e\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\uff0c\u6ce8\u91cd\u5b89\u5168\u6027\u548c\u4ee3\u7801\u8d28\u91cf\u3002\r\n\r\nOpenBSD\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8esys/kern/sysv_sem.c\u4e2dsys_semget()\u51fd\u6570\u5728tsleep\u540e\u56e0\u4e0a\u4e0b\u6587\u5207\u6362\u5bfc\u81f4\u5185\u5b58\u9519\u8bef\u5f15\u7528\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u672c\u5730\u6743\u9650\u63d0\u5347\u81f3root\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "OpenBSD\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-26371\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Openbsd OpenBSD \u003c=7.9"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-57589",
  "serverity": "\u4e2d",
  "submitTime": "2026-06-27",
  "title": "OpenBSD\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-26371\uff09"
}

CVE-2026-57589 (GCVE-0-2026-57589)

Vulnerability from cvelistv5 – Published: 2026-06-25 00:33 – Updated: 2026-06-26 03:55

Summary

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().

Severity

7.4 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-25 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

2 references

URL	Tags
https://github.com/openbsd/src/commit/1957873d206…
https://openai.com/index/patch-the-planet/

Impacted products

1 product

Vendor	Product	Version
OpenBSD	OpenBSD	Affected: 0 , ≤ 7.9 (custom) cpe:2.3:o:openbsd:openbsd::::::::

Show details on NVD website

JSON

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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-25T00:00:00+00:00",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.