CVE-2025-22125
📋 TL;DR
A vulnerability in the Linux kernel's RAID1 and RAID10 implementations causes incorrect handling of I/O flags, leading to performance degradation and potential priority inversion issues. This affects systems using software RAID with blk-wbt enabled, particularly impacting write performance and I/O scheduling behavior.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Severe performance degradation causing system slowdowns, application timeouts, and potential data corruption due to priority inversion where critical I/O operations are delayed behind lower-priority tasks.
Likely Case
Reduced RAID write performance, increased I/O latency, and potential application performance issues on affected systems.
If Mitigated
Minimal impact with proper monitoring and performance tuning, though some performance degradation may still occur.
🎯 Exploit Status
This is a performance bug rather than a traditional security vulnerability. It doesn't enable privilege escalation or remote code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits 73506e581c0b, 8a0adf3d778c, or e879a0d9cb08
Vendor Advisory: https://git.kernel.org/stable/c/73506e581c0b1814cdfd2229d589f30751d7de26
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version matches patched release.
🔧 Temporary Workarounds
Disable blk-wbt for affected devices
linuxTemporarily disable write-back throttling for RAID devices to mitigate performance impact
echo 0 > /sys/block/mdX/queue/wbt_lat_usec
Use alternative I/O scheduler
linuxSwitch to different I/O scheduler that doesn't rely on the affected flag handling
echo none > /sys/block/mdX/queue/scheduler
🧯 If You Can't Patch
- Monitor system performance metrics for RAID arrays and investigate any unexplained performance degradation.
- Consider migrating critical workloads to unaffected storage configurations or hardware RAID solutions.
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if using RAID1/RAID10: uname -r && cat /proc/mdstatCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and check for improved RAID write performance metrics📡 Detection & Monitoring
Log Indicators:
- Increased I/O wait times in system logs
- RAID performance degradation alerts
- Application timeout errors related to storage
Network Indicators:
- None - this is a local storage issue
SIEM Query:
Search for: kernel version < patched_version AND (raid1 OR raid10 in configuration)