CVE-2024-41003
📋 TL;DR
This CVE-2024-41003 is a Linux kernel vulnerability in the BPF verifier component that can lead to privilege escalation. The flaw allows corruption of register state tracking during BPF program verification, potentially enabling malicious BPF programs to bypass security checks. This affects all Linux systems using BPF (Berkeley Packet Filter) functionality.
💻 Affected Systems
- Linux Kernel
📦 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
Local privilege escalation to root, allowing complete system compromise and potential container escape in containerized environments.
Likely Case
Local privilege escalation enabling attackers to gain root privileges on affected systems.
If Mitigated
Limited impact if BPF functionality is disabled or restricted via kernel lockdown, SELinux, or AppArmor policies.
🎯 Exploit Status
Exploitation requires crafting malicious BPF programs that trigger the verifier bug. The vulnerability was discovered through fuzzing, suggesting potential for reliable exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in kernel commits 41e8ab428a9964df378fa45760a660208712145b and 92424801261d1564a0bb759da3cf3ccd69fdf5a2
Vendor Advisory: https://git.kernel.org/stable/c/41e8ab428a9964df378fa45760a660208712145b
Restart Required: Yes
Instructions:
1. Update to a patched kernel version from your distribution vendor. 2. Reboot the system to load the new kernel. 3. Verify the fix by checking kernel version or testing BPF functionality.
🔧 Temporary Workarounds
Disable unprivileged BPF
linuxPrevents non-root users from loading BPF programs, reducing attack surface.
sysctl -w kernel.unprivileged_bpf_disabled=1
echo 'kernel.unprivileged_bpf_disabled=1' >> /etc/sysctl.conf
sysctl -p
Enable kernel lockdown
linuxRestricts kernel self-modification and module loading.
echo 'kernel_lockdown=on' >> /etc/default/grub
update-grub
reboot
🧯 If You Can't Patch
- Restrict BPF usage via SELinux/AppArmor policies to only trusted processes
- Implement strict user privilege separation and limit shell access to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with patched versions from your distribution. Vulnerable if using unpatched kernel with BPF enabled.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits: 41e8ab428a9964df378fa45760a660208712145b or 92424801261d1564a0bb759da3cf3ccd69fdf5a2📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing BPF program verification errors or crashes
- Audit logs showing unauthorized privilege escalation attempts
Network Indicators:
- Unusual BPF program loading patterns from non-privileged users
SIEM Query:
source="kernel" AND ("BPF" OR "verifier" OR "privilege escalation")