CVE-2024-46744

CVE Details

Release Date:

2024-09-18

Description

In the Linux kernel, the following vulnerability has been resolved:\nSquashfs: sanity check symbolic link size\nSyzkiller reports a 'KMSAN: uninit-value in pick_link' bug.\nThis is caused by an uninitialised page, which is ultimately caused\nby a corrupted symbolic link size read from disk.\nThe reason why the corrupted symlink size causes an uninitialised\npage is due to the following sequence of events:\n1. squashfs_read_inode() is called to read the symbolic\nlink from disk. This assigns the corrupted value\n3875536935 to inode->i_size.\n2. Later squashfs_symlink_read_folio() is called, which assigns\nthis corrupted value to the length variable, which being a\nsigned int, overflows producing a negative number.\n3. The following loop that fills in the page contents checks that\nthe copied bytes is less than length, which being negative means\nthe loop is skipped, producing an uninitialised page.\nThis patch adds a sanity check which checks that the symbolic\nlink size is not larger than expected.\n--\nV2: fix spelling mistake.

See more information about CVE-2024-46744 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-2024-12813	2024-11-12
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12868	2024-12-06
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12813	2024-11-12
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12815	2024-11-11
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12815	2024-11-11