CVE-2024-26870

CVE Details

Release Date:

2024-04-17

Description

In the Linux kernel, the following vulnerability has been resolved:\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size > 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n[ 99.403778] kernel BUG at mm/usercopy.c:102!\n[ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n[ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n[ 99.415827] Call trace:\n[ 99.415985] usercopy_abort+0x70/0xa0\n[ 99.416227] __check_heap_object+0x134/0x158\n[ 99.416505] check_heap_object+0x150/0x188\n[ 99.416696] __check_object_size.part.0+0x78/0x168\n[ 99.416886] __check_object_size+0x28/0x40\n[ 99.417078] listxattr+0x8c/0x120\n[ 99.417252] path_listxattr+0x78/0xe0\n[ 99.417476] __arm64_sys_listxattr+0x28/0x40\n[ 99.417723] invoke_syscall+0x78/0x100\n[ 99.417929] el0_svc_common.constprop.0+0x48/0xf0\n[ 99.418186] do_el0_svc+0x24/0x38\n[ 99.418376] el0_svc+0x3c/0x110\n[ 99.418554] el0t_64_sync_handler+0x120/0x130\n[ 99.418788] el0t_64_sync+0x194/0x198\n[ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\nIssue is reproduced when generic_listxattr() returns 'system.nfs4_acl',\nthus calling lisxattr() with size = 16 will trigger the bug.\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size > 0 and the return value is greater than size.

See more information about CVE-2024-26870 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-2024-5101	2024-08-08
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14