A missing authorization check in the illumos zones statistics daemon (zonestatd) allows a local user in any zone to disrupt zonestat in other zones and to determine which zones are running. The zonestatd door server procedure, zsdserver() in usr/src/cmd/zonestat/zonestatd/zonestatd.c, handles the ZSDCMDNEWZONE command, which is intended to be sent by zoneadmd, without checking the caller's credentials. Because the zonestatd door is accessible to all users in every zone, an unprivileged user can send this command with an arbitrary zone ID, causing zonestatd to re-create its door file in that zone, so that new zonestat requests in that zone can fail while the file is replaced. The time taken to handle the command also reveals whether a given zone ID belongs to a running zone. The flaw has existed since 2010 (illumos-gate commit efd4c9b6), and affects any illumos distribution prior to illumos-gate commit 865b58d2.

Per https://illumos.topicbox.com/groups/developer/T3b859664594b7762-Maa764f8552227c7080bcaabc/cve-2026-104112-to-cve-2026-104117-denial-of-service-and-missing-authorization-in-door-servers illumos would like to report the following CVEs:

CVE-2026-104112 18494 nscd: unbounded file descriptor allocation

CVE-2026-104113 ipmgmtd double-frees caller credentials on authorization failure (OmniOS and SmartOS only, no general illumos issue)

CVE-2026-104114 18495 Empty nwamd Door payload allows Denial of Service

CVE-2026-104115 18496 Unauthenticated Stack Overflow in reparsed

CVE-2026-104116 18493 Missing doorucred Check in zonestatd

CVE-2026-104117 18492 Missing Authorization in ipmgmtd Allows IPMP Reconfiguration

These were all discovered by Robert French and James Wynne III.

Thank you, Dan McDonald, on behalf of illumos security