CVE-2024-49909
📋 TL;DR
This CVE describes a null pointer dereference vulnerability in the AMD display driver within the Linux kernel. If exploited, it could cause a kernel panic (system crash) or potentially allow local privilege escalation. The vulnerability affects Linux systems with AMD graphics hardware using the affected kernel versions.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to denial of service, or potential local privilege escalation allowing an attacker to gain root access.
Likely Case
Kernel panic causing system crash and denial of service when the vulnerable function is triggered.
If Mitigated
Minor system instability or crash requiring reboot, but no privilege escalation if kernel protections are active.
🎯 Exploit Status
Requires local access and ability to trigger the specific display driver function. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits: 28574b08c70e56d34d6f6379326a860b96749051, 496486950c3d2aebf46a3be300296ac091da7a2d, 5298270bdabe97be5b8236e544c9e936415fe1f2, e087c9738ee1cdeebde346f4dfc819e5f7057e90, f38b09ba6a335c511eb27920bb9bb4a1b2c20084
Vendor Advisory: https://git.kernel.org/stable/c/28574b08c70e56d34d6f6379326a860b96749051
Restart Required: Yes
Instructions:
1. Update to a patched kernel version from your distribution's repositories. 2. Reboot the system to load the new kernel. 3. Verify the kernel version after reboot.
🔧 Temporary Workarounds
Disable AMD display driver (not recommended)
linuxDisable the affected AMD display driver module to prevent exploitation, but this will break graphics functionality.
echo 'blacklist amdgpu' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to systems with AMD graphics hardware
- Implement kernel hardening features like KASLR and SMAP/SMEP to reduce impact
🔍 How to Verify
Check if Vulnerable:
Check if your kernel version contains the vulnerable code by examining kernel source or checking distribution security advisories.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to one containing the fix commits, and check that the system remains stable during display operations.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg
- AMD display driver crash logs
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for kernel panic events or AMD driver crashes in system logs🔗 References
- https://git.kernel.org/stable/c/28574b08c70e56d34d6f6379326a860b96749051
- https://git.kernel.org/stable/c/496486950c3d2aebf46a3be300296ac091da7a2d
- https://git.kernel.org/stable/c/5298270bdabe97be5b8236e544c9e936415fe1f2
- https://git.kernel.org/stable/c/e087c9738ee1cdeebde346f4dfc819e5f7057e90
- https://git.kernel.org/stable/c/f38b09ba6a335c511eb27920bb9bb4a1b2c20084
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
