CVE-2023-23586
Published: October 18, 2023Last modified: April 16, 2024
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
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.5 |
Attack Vector | LOCAL |
Attack complexity | LOW |
Privileges required | LOW |
User interaction | NONE |
Scope | UNCHANGED |
Confidentiality | HIGH |
Integrity impact | NONE |
Availability impact | NONE |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Status
Product | Release | Package | Status |
---|---|---|---|
Alpaquita Linux | Stream | linux-lts | Not affected (6.1.33-r0) |