CVE-2024-47699

CVE Details

Release Date:

2024-10-21

Description

In the Linux kernel, the following vulnerability has been resolved:\nnilfs2: fix potential null-ptr-deref in nilfs_btree_insert()\nPatch series 'nilfs2: fix potential issues with empty b-tree nodes'.\nThis series addresses three potential issues with empty b-tree nodes that\ncan occur with corrupted filesystem images, including one recently\ndiscovered by syzbot.\nThis patch (of 3):\nIf a b-tree is broken on the device, and the b-tree height is greater than\n2 (the level of the root node is greater than 1) even if the number of\nchild nodes of the b-tree root is 0, a NULL pointer dereference occurs in\nnilfs_btree_prepare_insert(), which is called from nilfs_btree_insert().\nThis is because, when the number of child nodes of the b-tree root is 0,\nnilfs_btree_do_lookup() does not set the block buffer head in any of\npath[x].bp_bh, leaving it as the initial value of NULL, but if the level\nof the b-tree root node is greater than 1, nilfs_btree_get_nonroot_node(),\nwhich accesses the buffer memory of path[x].bp_bh, is called.\nFix this issue by adding a check to nilfs_btree_root_broken(), which\nperforms sanity checks when reading the root node from the device, to\ndetect this inconsistency.\nThanks to Lizhi Xu for trying to solve the bug and clarifying the cause\nearly on.

See more information about CVE-2024-47699 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:	None
Integrity:	None
Availability:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12884	2024-12-16