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
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Wed, 12 Mar 2025 20:15:00 +0000
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Status: PUBLISHED
Assigner: Google
Published: 2023-02-17T12:25:35.000Z
Updated: 2025-03-12T20:08:30.870Z
Reserved: 2023-01-13T13:15:22.698Z
Link: CVE-2023-23586

Updated: 2024-08-02T10:35:33.335Z

Status : Modified
Published: 2023-02-17T13:15:10.737
Modified: 2024-11-21T07:46:29.090
Link: CVE-2023-23586
