CVE-2026-104112
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.
How to fix
- illumos illumos-gateaf810a72c09944e884ec695e8dbf1702a4f424ae or later
- OmniOS OmniOSr151054, r151058w, r151056aw, r151054bw or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| illumos illumos-gate | cb5caa98562cf06753163f558cbcfe30b8f4673a ≤ v < af810a72c09944e884ec695e8dbf1702a4f424ae | af810a72c09944e884ec695e8dbf1702a4f424ae |
| OmniOS OmniOS | any ≤ v < r151054, r151058 ≤ v < r151058w, r151056 ≤ v < r151056aw, r151054 ≤ v < r151054bw | r151054, r151058w, r151056aw, r151054bw |
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