CVE-2024-44979
📋 TL;DR
This CVE describes a memory leak vulnerability in the Linux kernel's Xe graphics driver. When the driver reloads, it fails to properly destroy workqueues for pagefault and access counter handling, causing gradual memory consumption. This affects systems using the Xe graphics driver in the Linux kernel.
💻 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 →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
Sustained exploitation could lead to kernel memory exhaustion, causing system instability, crashes, or denial of service on affected systems.
Likely Case
Gradual memory consumption over multiple driver reload cycles, potentially leading to performance degradation or system instability requiring reboots.
If Mitigated
Minimal impact with proper monitoring and memory limits in place; memory would eventually be reclaimed on system reboot.
🎯 Exploit Status
Requires local access to trigger driver reloads; exploitation would need to be combined with other vulnerabilities or malicious local users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commit 7586fc52b14e0b8edd0d1f8a434e0de2078b7b2b or later
Vendor Advisory: https://git.kernel.org/stable/c/a6f78359ac75f24cac3c1bdd753c49c1877bcd82
Restart Required: Yes
Instructions:
1. Update to a patched Linux kernel version from your distribution vendor. 2. Reboot the system to load the new kernel. 3. Verify the fix is applied by checking kernel version or commit hash.
🔧 Temporary Workarounds
Limit Xe driver reloads
linuxAvoid unnecessary reloads of the Xe graphics driver to minimize memory leak accumulation
Monitor kernel memory usage
linuxImplement monitoring for kernel memory consumption and alert on abnormal patterns
cat /proc/meminfo | grep Slab
slabtop -o
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local users from triggering driver reloads
- Monitor system memory usage closely and schedule regular reboots if memory consumption becomes problematic
🔍 How to Verify
Check if Vulnerable:
Check if your kernel version includes the vulnerable Xe driver code by examining kernel version or checking for the specific vulnerable commitCheck Version:
uname -rVerify Fix Applied:
Verify the kernel version includes commit 7586fc52b14e0b8edd0d1f8a434e0de2078b7b2b or check with your distribution's security advisory📡 Detection & Monitoring
Log Indicators:
- Kernel oom-killer messages
- System instability logs
- Memory pressure warnings in dmesg
SIEM Query:
source="kernel" AND ("out of memory" OR "oom-killer" OR "memory pressure")