CVE-2022-49615
📋 TL;DR
A NULL pointer dereference vulnerability in the Linux kernel's ASoC rt711-sdca audio driver can cause kernel panic when an I/O error occurs during initial settings operations. This affects systems using this specific audio codec driver. The vulnerability requires local access to trigger.
💻 Affected Systems
- Linux kernel with rt711-sdca audio 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
Kernel panic leading to system crash and denial of service, potentially causing data loss or system instability.
Likely Case
System crash or instability when audio device experiences I/O errors during initialization.
If Mitigated
Minor system disruption that requires reboot, with no privilege escalation or data exfiltration.
🎯 Exploit Status
Exploitation requires local access and ability to trigger I/O errors on the audio device. No known active exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 1df793d479bef546569fc2e409ff8bb3f0fb8e99, 269be8b2907378adf72d7347cfa43ef230351a06, 7bb71133cae88d3003a3490b97864af76533072b
Vendor Advisory: https://git.kernel.org/stable/c/1df793d479bef546569fc2e409ff8bb3f0fb8e99
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check with your distribution for specific patched kernel versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable rt711-sdca module
linuxBlacklist or disable the vulnerable audio driver module
echo 'blacklist snd-soc-rt711-sdca' >> /etc/modprobe.d/blacklist.conf
rmmod snd-soc-rt711-sdca
🧯 If You Can't Patch
- Restrict local user access to systems with rt711-sdca hardware
- Monitor system logs for kernel panic events related to audio drivers
🔍 How to Verify
Check if Vulnerable:
Check if rt711-sdca module is loaded: lsmod | grep rt711-sdca AND check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits and rt711-sdca module loads without issues📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- NULL pointer dereference errors mentioning rt711-sdca
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND "panic" AND "rt711"