CVE-2024-26901

CVE Details

Release Date:

2024-04-17

Description

In the Linux kernel, the following vulnerability has been resolved:\ndo_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak\nsyzbot identified a kernel information leak vulnerability in\ndo_sys_name_to_handle() and issued the following report [1].\n[1]\n'BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]\nBUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40\ninstrument_copy_to_user include/linux/instrumented.h:114 [inline]\n_copy_to_user+0xbc/0x100 lib/usercopy.c:40\ncopy_to_user include/linux/uaccess.h:191 [inline]\ndo_sys_name_to_handle fs/fhandle.c:73 [inline]\n__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]\n__se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94\n__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94\n...\nUninit was created at:\nslab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\nslab_alloc_node mm/slub.c:3478 [inline]\n__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517\n__do_kmalloc_node mm/slab_common.c:1006 [inline]\n__kmalloc+0x121/0x3c0 mm/slab_common.c:1020\nkmalloc include/linux/slab.h:604 [inline]\ndo_sys_name_to_handle fs/fhandle.c:39 [inline]\n__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]\n__se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94\n__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94\n...\nBytes 18-19 of 20 are uninitialized\nMemory access of size 20 starts at ffff888128a46380\nData copied to user address 0000000020000240'\nPer Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to\nsolve the problem.

See more information about CVE-2024-26901 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	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-2024-3618	2024-06-05
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14