{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-104112", "assignerOrgId": "0ca53633-f0b5-4853-ba72-e0a2e62000d0", "state": "PUBLISHED", "assignerShortName": "illumos", "dateReserved": "2026-10-01T18:07:53.956Z", "datePublished": "2026-10-09T14:19:29.399Z", "dateUpdated": "2026-10-09T14:23:18.421Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "0ca53633-f0b5-4853-ba72-e0a2e62000d0", "shortName": "illumos", "dateUpdated": "2026-10-09T14:23:18.421Z"}, "title": "Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-772", "description": "CWE-772 Missing Release of Resource after Effective Lifetime", "type": "CWE"}]}], "affected": [{"vendor": "illumos", "product": "illumos-gate", "platforms": ["x86"], "collectionURL": "https://illumos.org", "packageName": "SUNWcs", "repo": "https://github.com/illumos/illumos-gate", "programFiles": ["usr/src/cmd/nscd/nscd_frontend.c"], "versions": [{"status": "affected", "version": "cb5caa98562cf06753163f558cbcfe30b8f4673a", "lessThan": "af810a72c09944e884ec695e8dbf1702a4f424ae", "changes": [{"at": "af810a72c09944e884ec695e8dbf1702a4f424ae", "status": "unaffected"}], "versionType": "git"}], "defaultStatus": "unaffected"}, {"vendor": "OmniOS", "product": "OmniOS", "versions": [{"status": "affected", "version": "any", "lessThan": "r151054", "versionType": "custom"}, {"status": "affected", "version": "r151058", "lessThan": "r151058w", "changes": [{"at": "r151058w", "status": "unaffected"}], "versionType": "custom"}, {"status": "affected", "version": "r151056", "lessThan": "r151056aw", "changes": [{"at": "r151056aw", "status": "unaffected"}], "versionType": "custom"}, {"status": "affected", "version": "r151054", "lessThan": "r151054bw", "changes": [{"at": "r151054bw", "status": "unaffected"}], "versionType": "custom"}], "defaultStatus": "affected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://illumos.topicbox.com/groups/developer/T3b859664594b7762/cve-2026-104112-to-cve-2026-104117-denial-of-service-and-missing-authorization-in-door-servers", "tags": ["mailing-list"]}, {"url": "https://illumos.org/issues/18494", "tags": ["issue-tracking"]}, {"url": "https://github.com/illumos/illumos-gate/commit/af810a72c09944e884ec695e8dbf1702a4f424ae", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "PROOF_OF_CONCEPT", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.8, "vectorString": "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"}}], "workarounds": [{"lang": "en", "value": "One can mitigate by disabling the name-service-cache SMF service in every affected zone, but once upgraded that service should be re-enabled.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "One can mitigate by disabling the name-service-cache SMF service in every affected zone, but once upgraded that service should be re-enabled."}]}], "solutions": [{"lang": "en", "value": "Update your illumos distribution to one that includes the fix for this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Update your illumos distribution to one that includes the fix for this issue."}]}], "credits": [{"lang": "en", "value": "Robert French", "type": "finder"}, {"lang": "en", "value": "James Wynne III", "type": "finder"}, {"lang": "en", "value": "Dan McDonald", "type": "remediation developer"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "hand-authored"}}}}

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