CVE-2026-104112 Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory
Local users can exhaust kernel memory by leaking file descriptors in the illumos name service cache daemon, causing system-wide denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104112?
CVE-2026-104112 is a medium-severity denial of service vulnerability in OmniOS, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A missing release of resources in the illumos name service cache daemon (nscd) allows a local user to exhaust kernel memory. The nscd door server procedure, switcher() in usr/src/cmd/nscd/nscd_frontend.c, does not close file descriptors that are passed with a door call but not used by the request, and the main nscd door at /var/run/name_service_door accepts passed descriptors from any user in its zone. Because nscd also runs with an unlimited file descriptor limit, an unprivileged local user, including one in a non-global zone, can repeatedly pass a descriptor to its zone's nscd in a door_call() loop, causing the file descriptor table of nscd to grow without bound in kernel memory. This causes a denial of service of nscd and can render processes in all zones on the host unresponsive. The flaw has existed since 2006 (illumos-gate commit cb5caa98), and affects any illumos distribution prior to illumos-gate commit af810a72.
Weakness: CWE-772
Which versions are affected by CVE-2026-104112?
How do I fix CVE-2026-104112?
No fix has been published for CVE-2026-104112 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-104112 being exploited?
There is no known exploitation of CVE-2026-104112 in the wild and no public exploit code.
Sources
Also known as GHSA-77hg-3j5h-xvf6.