Vulnerability · Published Oct 9, 2026 · Assigned by illumos

CVE-2026-104112Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory

Medium 6.8

In plain English

A medium-severity security flaw in illumos-gate from illumos. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 4.0)6.8Medium

Exploit odds (30 days)0.1%top 98.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
illumos	illumos-gate	cb5caa98562cf06753163f558cbcfe30b8f4673a – before af810a72c09944e884ec695e8dbf1702a4f424ae
OmniOS	OmniOS	any – before r151054r151058 – before r151058wr151056 – before r151056awr151054 – before r151054bw

Weakness: CWE-772 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:P

In plain English

Official description

Affected products (as reported)

References