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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().

PUBLISHED Reserved 2026-06-25 | Published 2026-06-25 | Updated 2026-06-25 | Assigner mitre




HIGH: 7.4CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-416 Use After Free

Product status

Default status
unaffected

Any version
affected

References

github.com/...ommit/1957873d2063db11dab780eca75b5e629d1e838d

openai.com/index/patch-the-planet/

cve.org (CVE-2026-57589)

nvd.nist.gov (CVE-2026-57589)

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