CVE-2001-1559: OpenBSD

Medium severity, CVSS 5.5. EPSS: 1.5% chance of exploitation in the next 30 days.

The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.

Affected products

• OpenBSD OpenBSD: version 2.9 only; version 3.0 only

Published 2001-12-31. Last modified 2026-06-16.