CVE Published: 17/02/2023 |
CVE Updated: 02/08/2024 |
CVE Year: 2023 Source: Google |
Vendor: Linux |
Product: Linux Kernel Status : PUBLISHED
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. 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
Metrics
CVSS Version: 3.1 |
Base Score: 5.5 MEDIUM Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N