Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory
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.
CVE-2026-104112
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-104112
illumos-gate
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
OmniOS
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/illumos/illumos-gate",
"vendor": "illumos",
"product": "illumos-gate",
"versions": [
{
"status": "affected",
"changes": [
{
"at": "af810a72c09944e884ec695e8dbf1702a4f424ae",
"status": "unaffected"
}
],
"version": "cb5caa98562cf06753163f558cbcfe30b8f4673a",
"lessThan": "af810a72c09944e884ec695e8dbf1702a4f424ae",
"versionType": "git"
}
],
"platforms": [
"x86"
],
"packageName": "SUNWcs",
"programFiles": [
"usr/src/cmd/nscd/nscd_frontend.c"
],
"collectionURL": "https://illumos.org",
"defaultStatus": "unaffected"
},
{
"vendor": "OmniOS",
"product": "OmniOS",
"versions": [
{
"status": "affected",
"version": "any",
"lessThan": "r151054",
"versionType": "custom"
},
{
"status": "affected",
"changes": [
{
"at": "r151058w",
"status": "unaffected"
}
],
"version": "r151058",
"lessThan": "r151058w",
"versionType": "custom"
},
{
"status": "affected",
"changes": [
{
"at": "r151056aw",
"status": "unaffected"
}
],
"version": "r151056",
"lessThan": "r151056aw",
"versionType": "custom"
},
{
"status": "affected",
"changes": [
{
"at": "r151054bw",
"status": "unaffected"
}
],
"version": "r151054",
"lessThan": "r151054bw",
"versionType": "custom"
}
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-104112
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #16363 · Revision 1
- Added to Heist Feed
- Publisher date