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sssd

A vulnerability exists in SSSD's NFS idmap plugin where an out-of-bounds write can occur when processing oversized cached user or group name entries. This flaw can be triggered locally by requesting identity lookups that exceed buffer sizes, potentially causing a denial of service by crashing the identity mapping service and possibly corrupting adjacent memory.

CVE-2026-104036 describes a flaw in the SSSD NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data, resulting in an out-of-bounds write. This vulnerability can be triggered by a local attacker requesting identity lookups that resolve to oversized cached entries. The primary impact is denial of service due to crashing the identity mapping service, with potential memory corruption of adjacent process memory.

A vulnerability exists in SSSD's NFS idmap plugin where an out-of-bounds write can occur when processing oversized cached user or group name entries. This flaw can be triggered locally by requesting identity lookups that exceed buffer sizes, potentially causing a denial of service by crashing the id

A flaw was found in SSSD's NFS idmap plugin. (CVE-2026-104036)

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