CVE-2024-57943
📋 TL;DR
This CVE-2024-57943 is a Linux kernel vulnerability in the exFAT filesystem driver where newly allocated buffer data isn't properly zeroed before being written to storage. This could allow uninitialized memory content from the page cache to be written to disk, potentially exposing sensitive information. Systems using the Linux kernel with exFAT filesystem support are affected.
💻 Affected Systems
- Linux kernel
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Sensitive kernel memory contents (potentially containing passwords, encryption keys, or other confidential data) could be written to disk and later retrieved by attackers with filesystem access.
Likely Case
Information disclosure where random kernel memory contents get written to exFAT filesystems, potentially exposing system information or partial sensitive data.
If Mitigated
Limited impact if exFAT filesystems aren't used or if systems have proper access controls preventing unauthorized filesystem access.
🎯 Exploit Status
Exploitation requires local access and knowledge of exFAT filesystem operations to trigger the vulnerable code path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commit 942c6f91ab8d82a41650e717940b4e577173762f or 98e2fb26d1a9eafe79f46d15d54e68e014d81d8c
Vendor Advisory: https://git.kernel.org/stable/c/942c6f91ab8d82a41650e717940b4e577173762f
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel package. 3. Rebuild kernel if using custom kernel. 4. No reboot required for live kernel updates if supported.
🔧 Temporary Workarounds
Disable exFAT filesystem support
allRemove or blacklist exFAT kernel module to prevent vulnerable code from loading
echo 'blacklist exfat' > /etc/modprobe.d/blacklist-exfat.conf
rmmod exfat
Avoid exFAT filesystem usage
allDo not mount or use exFAT formatted partitions until patched
umount /dev/[exfat_device]
Comment out exFAT entries in /etc/fstab
🧯 If You Can't Patch
- Restrict filesystem access to trusted users only
- Monitor for unusual exFAT filesystem activity and access patterns
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if exFAT module is loaded: uname -r && lsmod | grep exfatCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and check git commit contains the fix: grep -q '942c6f91ab8d82a41650e717940b4e577173762f\|98e2fb26d1a9eafe79f46d15d54e68e014d81d8c' /proc/version📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing exFAT module loading
- Filesystem mount events for exFAT partitions
Network Indicators:
- None - this is a local filesystem vulnerability
SIEM Query:
source="kernel" AND ("exfat" OR "EXFAT")