OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root (CVE-2026-57589)

# NVD - cve-2026-57589 Source: [https://nvd.nist.gov/vuln/detail/cve-2026-57589](https://nvd.nist.gov/vuln/detail/cve-2026-57589) ### 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:**  **NIST:**NVD NVD assessment not yet provided\. ### References to Advisories, Solutions, and Tools By selecting these links, you will be leaving NIST webspace\. We have provided these links to other web sites because they may have information that would be of interest to you\. No inferences should be drawn on account of other sites being referenced, or not, from this page\. There may be other web sites that are more appropriate for your purpose\. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites\. Further, NIST does not endorse any commercial products that may be mentioned on these sites\. Please address comments about this page to[\[email protected\]](https://nvd.nist.gov/cdn-cgi/l/email-protection#0c627a684c62657f78226b637a)\. URLSource\(s\)Tag\(s\)[https://github\.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d](https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d)MITRE[https://openai\.com/index/patch\-the\-planet/](https://openai.com/index/patch-the-planet/)MITRE ### Weakness Enumeration CWE\-IDCWE NameSource[CWE\-416](http://cwe.mitre.org/data/definitions/416.html)Use After FreeMITRE ### Change History 3 change records found[show changes](https://nvd.nist.gov/vuln/detail/cve-2026-57589#VulnChangeHistorySection)