CVE-2024-44993
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in the Linux kernel's V3D GPU driver for Raspberry Pi 5. The vulnerability allows reading beyond allocated memory boundaries in the v3d_csd_job_run() function, potentially exposing kernel memory contents. Affected systems are those running vulnerable Linux kernel versions with the V3D driver enabled on Raspberry Pi 5 hardware.
💻 Affected Systems
- Linux kernel with V3D 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure leading to information leakage that could aid further exploitation, potential kernel panic or system instability.
Likely Case
Information disclosure of kernel memory contents, system instability or crashes when UBSAN is enabled.
If Mitigated
Minimal impact as the eighth register isn't currently used, but still represents a memory safety violation.
🎯 Exploit Status
Exploitation requires local access and ability to trigger GPU compute shader dispatch operations. The vulnerability is an out-of-bounds read, not write, limiting direct exploitation potential.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 497d370a644d95a9f04271aa92cb96d32e84c770 and d656b82c4b30cf12715e6cd129d3df808fde24a7 applied
Vendor Advisory: https://git.kernel.org/stable/c/497d370a644d95a9f04271aa92cb96d32e84c770
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For Raspberry Pi OS: Use 'sudo apt update && sudo apt upgrade'. 3. For custom kernels: Apply the patches from kernel.org. 4. Reboot the system to load the new kernel.
🔧 Temporary Workarounds
Disable V3D driver
linuxPrevent loading of the vulnerable V3D GPU driver module
echo 'blacklist v3d' | sudo tee /etc/modprobe.d/blacklist-v3d.conf
sudo update-initramfs -u
sudo reboot
Disable UBSAN
linuxTurn off Undefined Behavior Sanitizer to hide the warning (does not fix vulnerability)
Add 'ubsan=0' to kernel boot parameters in /boot/cmdline.txt
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable kernels
- Monitor system logs for UBSAN warnings related to V3D driver
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if V3D driver is loaded: 'uname -r' and 'lsmod | grep v3d'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is after fix commits and check dmesg for absence of UBSAN warnings related to v3d_csd_job_run📡 Detection & Monitoring
Log Indicators:
- UBSAN warnings in dmesg/kernel logs mentioning 'v3d_csd_job_run' and 'array-index-out-of-bounds'
- Kernel panic or instability when GPU operations are performed
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("UBSAN" AND "v3d" AND "out-of-bounds")