CVE-2022-50428
📋 TL;DR
This CVE-2022-50428 is an off-by-one error in the Linux kernel's ext4 filesystem fast-commit journaling feature that could cause kernel crashes or data corruption. It affects Linux systems using ext4 filesystem with fast-commit enabled. The vulnerability allows uninitialized memory to be written to disk, potentially leaking sensitive information.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash, data corruption in ext4 filesystem, or potential information disclosure through uninitialized memory written to disk.
Likely Case
System instability, filesystem corruption requiring fsck repair, or journal replay failures during system recovery.
If Mitigated
Minimal impact if fast-commit is disabled or systems are patched; potential for journal replay issues between patched and unpatched kernels.
🎯 Exploit Status
Exploitation requires triggering specific filesystem operations with fast-commit enabled. More likely to cause crashes/corruption than arbitrary code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in Linux kernel stable releases: 5.10.110, 5.15.33, 5.16.20, 5.17.1 and later
Vendor Advisory: https://git.kernel.org/stable/c/18f28f13301d1afb8cea9c4ddcecdbff14488ec6
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version matches patched release.
🔧 Temporary Workarounds
Disable fast-commit feature
linuxDisable ext4 fast-commit journaling feature to prevent triggering the vulnerability
tune2fs -O ^fast_commit /dev/[device]
🧯 If You Can't Patch
- Disable fast-commit on all ext4 filesystems using tune2fs command
- Monitor system logs for ext4 errors or kernel panics and have recovery procedures ready
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if fast-commit is enabled on ext4 filesystems: uname -r && dumpe2fs -h /dev/[device] | grep 'Filesystem features'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is at or above patched versions and check that filesystem operations complete without errors📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- ext4 filesystem errors in dmesg
- Journal replay failures during boot
Network Indicators:
- None - local filesystem vulnerability
SIEM Query:
source="kernel" AND ("ext4" OR "fast_commit") AND ("panic" OR "error" OR "corruption")