CVE-2023-23586 (GCVE-0-2023-23586)

Vulnerability from cvelistv5 – Published: 2023-02-17 12:25 – Updated: 2025-03-12 20:08
VLAI?
Title
Use after free in io_uring in the Linux Kernel
Summary
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
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Kernel Affected: 5.6 , ≤ 5.10.161 (custom)
Create a notification for this product.
Credits
Bing-Jhong Billy Jheng of Starlabs
Show details on NVD website
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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