CVE-2026-57589

sys/kern/sysvsem.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 syssemget...

CVE-2026-57589

The CVE-2026-57589 entry concerns OpenBSD (through 7.9) with a use-after-free in sys/kern/sysv_sem.c that enables a local privilege escalation to root . The root cause is a context switch use-after-free after tsleep in sys_semget(). This applies to the OpenBSD kernel code path handling System V s...