CVE-2022-49444
📋 TL;DR
This Linux kernel vulnerability allows out-of-bounds memory access when loading specially crafted kernel modules. Attackers with local access can trigger a denial-of-service (kernel crash) or potentially execute arbitrary code. All systems running affected Linux kernel versions are vulnerable.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, allowing complete system compromise.
Likely Case
Kernel panic leading to denial-of-service and system reboot.
If Mitigated
No impact if module loading is restricted via kernel lockdown or module signing requirements.
🎯 Exploit Status
Requires ability to load kernel modules (typically root or CAP_SYS_MODULE). Exploit involves crafting malicious ELF sections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel versions containing commits 09cb6663618a74fe5572a4931ecbf098832e79ec or later
Vendor Advisory: https://git.kernel.org/stable/c/09cb6663618a74fe5572a4931ecbf098832e79ec
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel.
🔧 Temporary Workarounds
Restrict module loading
allPrevent loading of untrusted kernel modules
echo 1 > /proc/sys/kernel/modules_disabled
sysctl -w kernel.modules_disabled=1
Enable kernel lockdown
allRestrict kernel self-modification capabilities
Add 'lockdown=integrity' or 'lockdown=confidentiality' to kernel boot parameters
🧯 If You Can't Patch
- Implement strict module signing requirements
- Restrict local user access and monitor for suspicious module loading
🔍 How to Verify
Check if Vulnerable:
Check kernel version against distribution security advisories. Vulnerable if running unpatched kernel before fix commits.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: 09cb6663618a74fe5572a4931ecbf098832e79ec or later📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- Page fault errors in kernel logs
- Unexpected module loading
Network Indicators:
- None - local exploit only
SIEM Query:
source="kernel" AND ("Oops" OR "page fault" OR "BUG")