CVE-2026-57589

7.8 highEPSS 0.2%

High (7.8) in openbsd openbsd. EPSS 0.2% chance of exploitation in the next 30 days.

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

CVSS 3.1

7.8 high

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2026-06-25
Modified: 2026-07-10
Record from: the NVD, synced 2026-10-19

Affected

openbsd:openbsd

References

https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d
https://openai.com/index/patch-the-planet/

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