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When a transaction is committed, C Xenstored will first check the quota is correct before attempting to commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built without -DNDEBUG (this is the default).
Use CWE-476, Xen vendor hub and Xen product page to widen CVE-2023-34323 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-58143, CVE-2025-58142 and CVE-2025-27466 for nearby disclosures in the same product family.