CVE-2023-52622

CVE Details

Release Date:	2024-03-26
Impact:	Low	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved:\next4: avoid online resizing failures due to oversized flex bg\nWhen we online resize an ext4 filesystem with a oversized flexbg_size,\nmkfs.ext4 -F -G 67108864 -b 4096 100M\nmount \nresize2fs 16G\nthe following WARN_ON is triggered:\n==================================================================\nWARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550\nModules linked in: sg(E)\nCPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314\nRIP: 0010:__alloc_pages+0x411/0x550\nCall Trace:\n\n__kmalloc_large_node+0xa2/0x200\n__kmalloc+0x16e/0x290\next4_resize_fs+0x481/0xd80\n__ext4_ioctl+0x1616/0x1d90\next4_ioctl+0x12/0x20\n__x64_sys_ioctl+0xf0/0x150\ndo_syscall_64+0x3b/0x90\n==================================================================\nThis is because flexbg_size is too large and the size of the new_group_data\narray to be allocated exceeds MAX_ORDER. Currently, the minimum value of\nMAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding\nmaximum number of groups that can be allocated is:\n(PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ? 21845\nAnd the value that is down-aligned to the power of 2 is 16384. Therefore,\nthis value is defined as MAX_RESIZE_BG, and the number of groups added\neach time does not exceed this value during resizing, and is added multiple\ntimes to complete the online resizing. The difference is that the metadata\nin a flex_bg may be more dispersed.

See more information about CVE-2023-52622 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-5101	2024-08-08
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14