In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*

No data.

References
Link Providers
https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb cve-icon cve-icon
https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438 cve-icon cve-icon
https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4 cve-icon cve-icon
https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d cve-icon cve-icon
https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e cve-icon cve-icon
https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90 cve-icon cve-icon
https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90 cve-icon cve-icon
https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024091836-CVE-2024-46744-451f@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-46744 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-46744 cve-icon
History

Mon, 30 Sep 2024 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-59
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Sun, 29 Sep 2024 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 18 Sep 2024 14:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 18 Sep 2024 07:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.
Title Squashfs: sanity check symbolic link size
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-09-18T07:12:04.975Z

Updated: 2024-12-19T09:22:15.871Z

Reserved: 2024-09-11T15:12:18.266Z

Link: CVE-2024-46744

cve-icon Vulnrichment

Updated: 2024-09-29T14:49:31.780Z

cve-icon NVD

Status : Analyzed

Published: 2024-09-18T08:15:03.603

Modified: 2024-09-30T13:36:19.557

Link: CVE-2024-46744

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-09-18T00:00:00Z

Links: CVE-2024-46744 - Bugzilla