---
id: CVE-2026-104112
title: >-
  A missing release of resources in the illumos name service cache daemon (nscd)
  allows a local user to exhaust kernel memory
summary: >-
  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 …
severity: none
cwe:
  - CWE-772
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T17:16:44.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104112'
references:
  - url: >-
      https://github.com/illumos/illumos-gate/commit/af810a72c09944e884ec695e8dbf1702a4f424ae
    label: 0ca53633-f0b5-4853-ba72-e0a2e62000d0
  - url: 'https://illumos.org/issues/18494'
    label: 0ca53633-f0b5-4853-ba72-e0a2e62000d0
  - url: >-
      https://illumos.topicbox.com/groups/developer/T3b859664594b7762/cve-2026-104112-to-cve-2026-104117-denial-of-service-and-missing-authorization-in-door-servers
    label: 0ca53633-f0b5-4853-ba72-e0a2e62000d0
tags:
  - nvd
ingestedAt: '2026-10-09T16:02:33.374Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.