CVE-2024-49876
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's Xe graphics driver. It allows attackers to potentially crash the system or execute arbitrary code by exploiting improper cleanup of workqueues during driver teardown. Systems running vulnerable Linux kernel versions with Xe graphics driver enabled are affected.
💻 Affected Systems
- Linux kernel with Xe graphics 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-level code execution.
Likely Case
System crash or instability when graphics operations are performed during driver teardown scenarios.
If Mitigated
Limited to denial of service if exploit attempts are detected and blocked by security controls.
🎯 Exploit Status
Exploitation requires local access and timing conditions during driver teardown. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commit 861108666cc0e999cffeab6aff17b662e68774e3 or later
Vendor Advisory: https://git.kernel.org/stable/c/272b0e78874586d6ccae04079d75b27b47705544
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commit. 2. For distributions: Use package manager to update kernel package. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable Xe graphics driver
linuxPrevent loading of the vulnerable Xe driver module
echo 'blacklist xe' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to systems with Xe driver enabled
- Monitor for kernel panic or crash events related to graphics operations
🔍 How to Verify
Check if Vulnerable:
Check if Xe driver is loaded: lsmod | grep xe. If loaded, check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commit: grep -q '861108666cc0e999cffeab6aff17b662e68774e3' /proc/version_signature || uname -r📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Use-after-free warnings in dmesg
- Graphics driver crash logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("use-after-free" OR "UAF" OR "xe" OR "panic")