{"uuid": "a4e18ecc-dc9b-4150-8eb6-7a370b1e526a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2023-23586", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/7383", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2023-23586\n\ud83d\udd25 CVSS Score: 5.5 (cvssV3_1, Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)\n\ud83d\udd39 Description: Due to a vulnerability in the io_uring subsystem, it is possible to leak kernel memory information to the user process.\u00a0timens_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\u00a0 788d0824269bef539fe31a785b1517882eafed93 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring \n\n\ud83d\udccf Published: 2023-02-17T12:25:35.000Z\n\ud83d\udccf Modified: 2025-03-12T20:08:30.870Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93\n2. https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93", "creation_timestamp": "2025-03-12T20:42:49.000000Z"}