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
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Mar 6, 2023 | Feb 17, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade python3-perfUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelists | Jul 5, 2023 | Feb 17, 2023 |
| Suse | — | Upgrade kernel-macrosUpgrade kernel-develUpgrade reiserfs-kmp-defaultUpgrade kernel-symsUpgrade kernel-zfcpdumpUpgrade kernel-64kb-develUpgrade kernel-default-develUpgrade kernel-default-baseUpgrade kernel-sourceUpgrade kernel-64kbUpgrade kernel-docsUpgrade kernel-defaultUpgrade dtb-zteUpgrade kernel-preempt-develUpgrade kernel-obs-buildUpgrade kernel-preemptUpgrade dtb-al | Jun 23, 2023 | Feb 17, 2023 |
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