high CVSS 7.8

CVE-2024-46744·Kernel vulnerability

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.

Severity: high
Software: Kernel
Fixed in: 6.10.10
Published: 2024-09-18

Affected versions

From: 6.7

Until: 6.10.10

Fixed in: 6.10.10

How to fix this CVE

Update your Linux kernel to version 6.10.10 or later to patch the Squashfs symbolic link validation vulnerability. This fix introduces proper sanity checks to prevent corrupted symlink metadata from causing memory corruption and system instability. Affected kernels 6.7 through 6.10.9 should be prioritized for immediate patching.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

Step 1: Check installed kernel version with: uname -r (output should be 6.10.10 or later, or outside the 6.7-6.10.9 range)
Step 2: Verify Squashfs is in use by checking mounted filesystems: mount | grep squashfs or lsmod | grep squashfs
Step 3: Review kernel logs for KMSAN errors or memory initialization warnings: sudo dmesg | grep -i 'KMSAN\|uninit-value\|pick_link'
Step 4: Confirm the patch is applied by checking kernel source or changelog: cat /proc/version or sudo apt-cache policy linux-image-generic

FAQ

What is CVE-2024-46744?

This vulnerability exists in the Linux Squashfs filesystem driver where corrupted symbolic link size metadata causes integer overflow and uninitialized memory to be exposed, leading to potential information disclosure or system instability.

Is CVE-2024-46744 being actively exploited?

No, this vulnerability is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available. Exploitation requires local access and disk-level filesystem corruption.

What versions of Kernel are affected by CVE-2024-46744?

Linux kernel versions 6.7 through 6.10.9 are vulnerable. Version 6.10.10 and later contain the fix. Users on older LTS kernels (6.1.x, 6.6.x) should verify their distribution's backport status.

How do I check if my server is vulnerable to CVE-2024-46744?

Run: uname -r | grep -E '^6\.(7|8|9|10\.[0-9]($|[^0-9]))' — if this matches, your kernel is vulnerable. Cross-reference with your distribution's kernel package version.

Does Defensia detect CVE-2024-46744?

Yes — Defensia's CVE advisory scanner compares installed kernel package versions against the NVD database. If a vulnerable kernel version (6.7-6.10.9) is detected on a monitored system, CVE-2024-46744 will appear in your dashboard with remediation steps.

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References

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