CVE-2022-49252
📋 TL;DR
This CVE involves an out-of-bounds array access vulnerability in the Linux kernel's ASoC rx-macro codec driver. On 64-bit ARM (aarch64) systems, improper enum handling could allow memory corruption, potentially leading to system crashes or privilege escalation. Affected systems are those running vulnerable Linux kernel versions with the rx-macro codec enabled.
💻 Affected Systems
- Linux kernel with ASoC rx-macro codec 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to denial of service, or potential privilege escalation to kernel mode allowing complete system compromise.
Likely Case
System crash or instability when specific audio operations are performed on affected ARM64 systems.
If Mitigated
No impact if the vulnerable codec driver is not loaded or the system is not ARM64 architecture.
🎯 Exploit Status
Exploitation requires triggering specific audio operations on vulnerable ARM64 systems with the affected driver loaded.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing fixes from the provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/7e3629e256d1cabf801d00050550ade4d036cafe
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix. 2. Rebuild kernel if compiling from source. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable rx-macro codec module
linuxPrevent loading of the vulnerable driver module
echo 'blacklist snd_soc_rx_macro' >> /etc/modprobe.d/blacklist.conf
rmmod snd_soc_rx_macro
🧯 If You Can't Patch
- Restrict user access to audio devices and operations
- Implement strict application control to prevent unauthorized audio applications
🔍 How to Verify
Check if Vulnerable:
Check if rx-macro module is loaded: lsmod | grep rx_macro AND check kernel version against vulnerable rangeCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated beyond vulnerable commits and rx-macro module loads without errors📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes during audio operations
- dmesg errors mentioning rx_macro
Network Indicators:
- None - local vulnerability
SIEM Query:
source="kernel" AND ("oops" OR "panic") AND "rx_macro"