CVE-2025-22034
📋 TL;DR
A Linux kernel vulnerability in the memory management subsystem allows device-exclusive memory entries to interfere with proper memory management operations. This can prevent memory pages from being swapped out or migrated, potentially leading to system instability or denial of service. Systems using device-exclusive memory features (like HMM - Heterogeneous Memory Management) with hugetlb or THP configurations 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
System becomes unresponsive due to inability to reclaim or migrate memory, potentially causing kernel panics or complete system hangs during memory pressure scenarios.
Likely Case
Memory management operations fail silently, leading to inefficient memory usage, reduced system performance, and potential application crashes when memory cannot be properly allocated.
If Mitigated
With proper patching, normal memory management operations proceed without interference from device-exclusive entries.
🎯 Exploit Status
The provided program demonstrates the issue but requires specific HMM configurations and device-exclusive memory operations. Exploitation requires local access and ability to allocate device-exclusive memory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in kernel commits: 2e877ff3492267def06dd50cb165dc9ab8838e7d, 48d28417c66cce2f3b0ba773fcb6695a56eff220, 8977752c8056a6a094a279004a49722da15bace3, fd900832e8440046627b60697687ab5d04398008
Vendor Advisory: https://git.kernel.org/stable/c/2e877ff3492267def06dd50cb165dc9ab8838e7d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fixes. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel package. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable HMM features
linuxDisable Heterogeneous Memory Management features if not required
echo 'blacklist hmm' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
Disable THP and hugetlb
linuxDisable Transparent Huge Pages and hugetlb if not needed
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo 0 > /proc/sys/vm/nr_hugepages
🧯 If You Can't Patch
- Monitor system memory usage and restart services experiencing memory pressure
- Implement memory limits and monitoring for processes using device-exclusive memory
🔍 How to Verify
Check if Vulnerable:
Check if system uses HMM features and device-exclusive memory operations. Review kernel logs for migration failures or memory management errors.Check Version:
uname -rVerify Fix Applied:
Check kernel version includes the fix commits. Test with hmm-tests selftests if available.📡 Detection & Monitoring
Log Indicators:
- kernel logs showing 'migration failure'
- page allocation failures
- memory pressure warnings
Network Indicators:
- None - this is a local memory management issue
SIEM Query:
source="kernel" AND ("migration failure" OR "page dumped because" OR "device-exclusive")