Link Following Affecting kernel package, versions <0:4.14.355-271.569.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-8382889
- published 16 Nov 2024
- disclosed 18 Sep 2024
Introduced: 18 Sep 2024
CVE-2024-46744 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.355-271.569.amzn2 or higher.
This issue was patched in ALAS2-2024-2696.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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:
squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size.
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.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46744
- https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb
- https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438
- https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4
- https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d
- https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e
- https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90
- https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90
- https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d