{"id":"CVE-2023-23586","details":"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. We recommend upgrading past version 5.10.161 or commit  788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring \n","modified":"2026-03-14T11:58:33.609673Z","published":"2023-02-17T13:15:10.737Z","related":["SUSE-SU-2023:2502-1","SUSE-SU-2023:2611-1","SUSE-SU-2023:2651-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93"},{"type":"FIX","url":"https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"5.6"},{"fixed":"5.10.161"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-23586.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}