CVE-2022-50079
📋 TL;DR
This CVE describes an out-of-bounds memory access vulnerability in the AMD display driver for Linux kernel's DCN303 architecture. An attacker with local access could potentially read or write beyond allocated memory boundaries, leading to system instability or privilege escalation. This affects Linux systems with AMD graphics hardware using the vulnerable driver.
💻 Affected Systems
- Linux kernel with AMD display driver (drm/amd/display)
📦 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
Local privilege escalation to kernel-level access, potentially leading to full system compromise, data theft, or persistent backdoor installation.
Likely Case
System crash, kernel panic, or denial of service due to memory corruption, requiring system reboot to recover.
If Mitigated
Limited impact with proper access controls; non-privileged users cannot trigger the vulnerability.
🎯 Exploit Status
Exploitation requires local access and knowledge of the vulnerable driver interface. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions containing commits 4c31dca1799612eb3b6413e3e574f90c3fb8f865, 82a27c1855445d48aacc67b0c0640f3dadebe52f, or 89b008222c2bf21e50219725caed31590edfd9d1
Vendor Advisory: https://git.kernel.org/stable/c/4c31dca1799612eb3b6413e3e574f90c3fb8f865
Restart Required: Yes
Instructions:
1. Update Linux kernel to a version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify AMD display driver is functioning correctly.
🔧 Temporary Workarounds
Restrict local user access
linuxLimit local user accounts and implement strict access controls to reduce attack surface
Disable vulnerable hardware
linuxBlacklist or disable the AMD display driver if not required
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor system logs for kernel panics or unusual display driver behavior
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if it contains the vulnerable DCN303 display driver code. Use 'uname -r' and examine kernel source or distribution security advisories.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to include the fix commits. Check system logs for stable operation after patch application.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- AMD display driver errors in dmesg
- System crash reports
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for: 'kernel panic', 'amdgpu error', 'DCN303', 'out of bounds' in system logs