CVE-2024-58237
📋 TL;DR
This Linux kernel vulnerability in the BPF subsystem allows unsafe memory access when tail calls invalidate packet pointers. It affects systems running vulnerable Linux kernel versions with BPF programs enabled, potentially leading to kernel crashes or privilege escalation.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash or potential privilege escalation if combined with other vulnerabilities
Likely Case
Kernel crash or system instability when malicious BPF programs are loaded
If Mitigated
No impact if BPF is disabled or proper kernel hardening is in place
🎯 Exploit Status
Exploitation requires ability to load malicious BPF programs and understanding of kernel memory layout
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits: 1a4607ffba35bf2a630aab299e34dd3f6e658d70, 1c2244437f9ad3dd91215f920401a14f2542dbfc, f1692ee23dcaaddc24ba407b269707ee5df1301f)
Vendor Advisory: https://git.kernel.org/stable/c/1a4607ffba35bf2a630aab299e34dd3f6e658d70
Restart Required: Yes
Instructions:
1. Update to latest stable Linux kernel version containing the fix. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable BPF subsystem
linuxPrevent loading of BPF programs by disabling the BPF subsystem
echo 0 > /proc/sys/kernel/unprivileged_bpf_disabled
Remove CAP_BPF capabilities from users
Restrict BPF program loading
linuxLimit which users can load BPF programs using capabilities
setcap -r /path/to/program cap_bpf
Use seccomp to filter bpf() syscall
🧯 If You Can't Patch
- Restrict BPF program loading to trusted users only
- Implement strict seccomp policies to filter bpf() syscall
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if patches are applied by examining kernel source or distribution security advisoriesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version after update matches patched version from distribution vendor📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- BPF program loading failures
- System crash reports
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("panic" OR "oops" OR "BPF")