CVE-2022-48889
📋 TL;DR
This CVE describes a buffer overflow vulnerability in the Linux kernel's ASoC Intel sof-nau8825 driver where module alias names exceed the 20-character limit. This causes compilation errors and potential memory corruption during kernel module loading. Systems running affected Linux kernel versions with this specific audio driver are vulnerable.
💻 Affected Systems
- Linux kernel with ASoC Intel sof-nau8825 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic or system crash during module loading, potentially leading to denial of service or local privilege escalation if combined with other vulnerabilities.
Likely Case
Kernel compilation/build failures when building affected driver modules, preventing proper audio functionality.
If Mitigated
Build errors caught during compilation, preventing vulnerable modules from being loaded.
🎯 Exploit Status
Exploitation requires local access and ability to trigger kernel module operations. The vulnerability was discovered during build testing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits 3e78986a840d59dd27e636eae3f52dc11125c835 and fba1b23befd88366fe646787b3797e64d7338fd2
Vendor Advisory: https://git.kernel.org/stable/c/3e78986a840d59dd27e636eae3f52dc11125c835
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Rebuild kernel modules if using custom kernel. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable vulnerable driver
linuxPrevent loading of the sof-nau8825 driver module
echo 'blacklist snd-soc-sof_nau8825' >> /etc/modprobe.d/blacklist.conf
rmmod snd-soc-sof_nau8825
🧯 If You Can't Patch
- Restrict local user access to kernel module loading operations
- Monitor system logs for module loading failures or kernel panics
🔍 How to Verify
Check if Vulnerable:
Check if kernel has sof-nau8825 driver: lsmod | grep nau8825 and check kernel version against patched commitsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits and attempt to load the driver module📡 Detection & Monitoring
Log Indicators:
- Kernel compilation errors mentioning MODULE_ALIAS overflow
- System logs showing module loading failures
- Kernel panic messages during audio initialization
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for: 'MODULE_ALIAS overflow' OR 'sof_nau8825' AND (error OR panic OR fail)