CVE-2025-21651
📋 TL;DR
A race condition vulnerability in the Linux kernel's HNS3 network driver allows a kernel warning/panic when handling interrupts during initialization. This affects systems using Huawei HNS3 network hardware with vulnerable kernel versions. The vulnerability can cause system instability or crashes.
💻 Affected Systems
- Linux kernel with HNS3 network driver
📦 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 →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 crash or kernel panic leading to denial of service, potentially disrupting network connectivity and system availability.
Likely Case
Kernel warning messages in logs and potential system instability during driver initialization, but unlikely to be actively exploited for privilege escalation.
If Mitigated
Minor performance impact during network driver initialization with proper patching.
🎯 Exploit Status
This is a race condition that occurs during specific initialization timing, not a typical security exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 98b1e3b27734139c76295754b6c317aa4df6d32e and bcf430d3bb5525fc89a92a0c451c725ba1aa4306
Vendor Advisory: https://git.kernel.org/stable/c/98b1e3b27734139c76295754b6c317aa4df6d32e
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify HNS3 driver loads without warnings.
🔧 Temporary Workarounds
Disable HNS3 driver if not needed
linuxBlacklist or disable the HNS3 network driver if alternative networking is available
echo 'blacklist hns3' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Monitor system logs for HNS3-related warnings and crashes
- Ensure proper system backups and recovery procedures are in place
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if HNS3 driver is loaded: lsmod | grep hns3 && uname -rCheck Version:
uname -rVerify Fix Applied:
Check kernel contains fix commits: git log --oneline | grep -E '98b1e3b27734|bcf430d3bb55'📡 Detection & Monitoring
Log Indicators:
- Kernel warnings mentioning hclge_errhand_task_schedule or hclge_misc_irq_handle
- Call trace with __queue_delayed_work in HNS3 context
Network Indicators:
- None - this is a local kernel issue
SIEM Query:
source="kernel" AND ("hclge_errhand_task_schedule" OR "hclge_misc_irq_handle")