CVE-2024-56614
📋 TL;DR
This CVE-2024-56614 is an out-of-bounds write vulnerability in the Linux kernel's XDP socket (xsk) map deletion function. It allows local attackers with CAP_BPF capability to write kernel memory beyond array bounds, potentially leading to privilege escalation or denial of service. Systems running vulnerable Linux kernel versions with XDP socket functionality are affected.
💻 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
Privilege escalation to root, kernel memory corruption leading to system crash, or arbitrary code execution in kernel context.
Likely Case
Kernel panic and system crash (denial of service) due to invalid memory access.
If Mitigated
No impact if CAP_BPF capability is restricted or XDP sockets are not used.
🎯 Exploit Status
Exploitation requires local access and CAP_BPF capability. The vulnerability is in a specific kernel subsystem (XDP sockets).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in kernel git commits: 32cd3db7de97c0c7a018756ce66244342fd583f0, 4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7, d486b5741d987d3e0e6be4ac22cafdf94e6d1a47, ed08c93d5a9801cc8f224a046411fd603c538d07, f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a
Vendor Advisory: https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0
Restart Required: Yes
Instructions:
1. Identify your Linux kernel version. 2. Check if patches are available for your distribution. 3. Update kernel package using your package manager (apt, yum, dnf, etc.). 4. Reboot system to load new kernel.
🔧 Temporary Workarounds
Restrict CAP_BPF capability
linuxRemove CAP_BPF capability from non-privileged users to prevent exploitation.
setcap -r cap_bpf /path/to/application
Use Linux capabilities to restrict CAP_BPF
Disable XDP sockets if not needed
linuxPrevent loading of XDP socket modules or disable XDP functionality.
modprobe -r xsk
Add 'blacklist xsk' to /etc/modprobe.d/
🧯 If You Can't Patch
- Restrict CAP_BPF capability to only essential system components
- Implement strict access controls to prevent local users from running arbitrary code
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if XDP socket functionality is present. Vulnerable if using unpatched kernel with xsk_map_delete_elem function.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to include one of the fix commits. Check /proc/version or uname -r.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages mentioning xsk_map_delete_elem
- Page fault errors at kernel addresses
- System crashes with XDP-related stack traces
Network Indicators:
- Unusual XDP socket operations from non-privileged users
SIEM Query:
source="kernel" AND ("xsk_map_delete_elem" OR "Oops" OR "page fault")🔗 References
- https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0
- https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7
- https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47
- https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07
- https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
