CVE-2026-57589

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().

CVSS v3 7.4 HIGH

7.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.4 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d	Patch
https://openai.com/index/patch-the-planet/	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-25 01:16

Updated : 2026-07-10 16:39

NVD link : CVE-2026-57589

Mitre link : CVE-2026-57589

CVE.ORG link : CVE-2026-57589

JSON object : View

Products Affected

openbsd

openbsd

CWE

CWE-416

Use After Free

{"id": "CVE-2026-57589", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-57589", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-25T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.4}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"vendor": "OpenBSD", "product": "OpenBSD", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "7.9"}], "defaultStatus": "unaffected"}]}], "published": "2026-06-25T01:16:26.537", "references": [{"url": "https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://openai.com/index/patch-the-planet/", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "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()."}], "lastModified": "2026-07-10T16:39:52.480", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2A4C65E8-9C59-4F6F-A5E1-74401542604D", "versionEndIncluding": "7.9"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}