CVE-2022-49270
📋 TL;DR
This is a use-after-free vulnerability in the Linux kernel's device mapper (dm) subsystem that occurs during cleanup of zoned block devices. An attacker with local access could potentially exploit this to cause a kernel crash (denial of service) or possibly execute arbitrary code with kernel privileges. Systems using Linux kernel with device mapper and zoned block devices 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, or potential arbitrary code execution with kernel privileges resulting in complete system compromise.
Likely Case
Kernel crash leading to system instability or denial of service requiring reboot.
If Mitigated
No impact if patched or if zoned block devices are not in use.
🎯 Exploit Status
Exploitation requires local access and knowledge of zoned block device operations. The vulnerability is triggered during device cleanup operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions containing commits 0987f00a76a17aa7213da492c00ed9e5a6210c73 or related fixes
Vendor Advisory: https://git.kernel.org/stable/c/0987f00a76a17aa7213da492c00ed9e5a6210c73
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel package. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Avoid zoned block devices
allDo not use zoned block devices with device mapper if possible
🧯 If You Can't Patch
- Restrict local user access to systems using zoned block devices
- Monitor for kernel panic/crash events and investigate any suspicious device mapper operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if using device mapper with zoned block devices. Vulnerable if kernel version is before the fix and zoned devices are in use.Check Version:
uname -rVerify Fix Applied:
Check that kernel version includes the fix commit or is from a distribution that has backported the patch.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- KASAN use-after-free reports in kernel logs
- Device mapper error messages during cleanup
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for: 'KASAN: use-after-free', 'dm_cleanup_zoned_dev', or kernel panic events