CVE-2022-50052
📋 TL;DR
This CVE describes a potential buffer overflow vulnerability in the Linux kernel's ASoC Intel AVS driver. The vulnerability could allow local attackers to execute arbitrary code or cause denial of service by exploiting improper use of snprintf(). This affects Linux systems with Intel audio hardware using the affected driver.
💻 Affected Systems
- Linux kernel with Intel ASoC AVS 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to complete system compromise.
Likely Case
Local denial of service (kernel panic/crash) or limited information disclosure.
If Mitigated
Minimal impact with proper kernel hardening and SELinux/AppArmor restrictions in place.
🎯 Exploit Status
Requires local access and kernel exploitation expertise. The vulnerability is in a specific audio driver component.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 840311a09f75632b9d41fbc1cd5c7aea94ce5f7e or ca3b7b9dc9bc1fa552f4697b7cccfa0258a44d00
Vendor Advisory: https://git.kernel.org/stable/c/840311a09f75632b9d41fbc1cd5c7aea94ce5f7e
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable Intel AVS driver
linuxPrevent loading of vulnerable driver module
echo 'blacklist snd-intel-avs' >> /etc/modprobe.d/blacklist.conf
rmmod snd-intel-avs
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable kernel
- Implement strict SELinux/AppArmor policies to limit kernel access
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if Intel AVS driver is loaded: 'uname -r' and 'lsmod | grep snd-intel-avs'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and driver version: 'modinfo snd-intel-avs | grep version'📡 Detection & Monitoring
Log Indicators:
- Kernel oops/panic messages related to snd-intel-avs
- Unexpected driver crashes in system logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("snd-intel-avs" OR "ASoC Intel AVS") AND ("panic" OR "oops" OR "segfault")