{"api_version":"1","generated_at":"2026-04-22T23:53:28+00:00","cve":"CVE-2023-23586","urls":{"html":"https://cve.report/CVE-2023-23586","api":"https://cve.report/api/cve/CVE-2023-23586.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-23586","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-23586"},"summary":{"title":"CVE-2023-23586","description":"Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process. timens_install calls current_is_single_threaded to determine if the current process is single-threaded, but this call does not consider io_uring's io_worker threads, thus it is possible to insert a time namespace's vvar page to process's memory space via a page fault. When this time namespace is destroyed, the vvar page is also freed, but not removed from the process' memory, and a next page allocated by the kernel will be still available from the user-space process and can leak memory contents via this (read-only) use-after-free vulnerability. 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