nscd: netgroup cache may terminate daemon on memory allocation failure

CVE-2024-33601

Summary

The Name Service Cache Daemon (nscd) is susceptible to a Denial of Service issue due to improper memory management. Specifically, the netgroup cache implementation utilizes xmalloc or xrealloc functions, which can lead to unexpected termination of the daemon in the event of a memory allocation failure. This flaw, introduced in glibc 2.15 when the netgroup cache was added, poses significant risks as it can disrupt service for clients relying on nscd. It is critical for users of affected glibc versions to apply updates to safeguard against potential service disruptions.

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