CVE-2026-57589
HIGHCVSS 7.8/10EPSS 0.13%
Last modified
CVE-2026-57589 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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().. EPSS estimates a 0.13% chance of exploitation in the next 30 days.
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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openbsd | <= 7.9 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is 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().
How severe is CVE-2026-57589?
CVE-2026-57589 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-57589?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-57575Misskey is an open source, federated social media platform. …6.9
- CVE-2026-5758JavaScript is vulnerable to prototype pollution in Mafintosh…6.5
- CVE-2026-57584Phalcon is a high-performance, full-stack PHP framework. Pri…8.7
- CVE-2026-57585MessagePack is the serializer implementation for Python msgp…7.5
- CVE-2026-57587A SQL injection vulnerability in Nessus allows a remote, una…5.3
- CVE-2026-57588A SQL injection vulnerability in Nessus allows an attacker t…3.3
- CVE-2026-57599There is a privilege escalation vulnerability in some Hikvis…6.6
- CVE-2026-5760SGLang's reranking endpoint (/v1/rerank) achieves Remote Cod…9.8
- CVE-2026-57600Insufficient validation of input parameters in the firmware …7.5
- CVE-2026-57617Contributor Cross Site Scripting (XSS) in SeedProd Pro < 6.1…6.5
- CVE-2026-57618Contributor Cross Site Scripting (XSS) in Neve PRO <= 3.1.2 …6.5
- CVE-2026-57619Contributor Sensitive Data Exposure in Elementor Website Bui…6.5
Are you affected by CVE-2026-57589?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST