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How CVE-2024-1086 Works
This vulnerability resides in the Linux kernel’s networking subsystem, specifically in the `netfilter` component. A use-after-free (UAF) flaw occurs when the kernel fails to properly release memory after a network packet is processed, allowing an attacker to manipulate freed memory pointers. By sending specially crafted packets, an attacker can trigger the UAF, leading to arbitrary code execution with kernel privileges. The exploit involves queuing malicious `sk_buff` objects and forcing improper garbage collection, which corrupts kernel memory. Successful exploitation results in full system compromise, bypassing security mechanisms like SELinux and SMAP.
DailyCVE Form
Platform: Linux Kernel
Version: 5.14 – 6.6
Vulnerability: Use-After-Free
Severity: Critical
Date: 2024-01-15
Prediction: Patch expected by 2024-02-10
What Undercode Say:
Exploitation Commands:
1. Craft malicious packet:
python3 -c 'from scapy.all import ; send(IP(dst="target")/fuzz(Raw(b"\x41"1000))'
2. Trigger UAF via netfilter:
// PoC kernel module to force race condition
include <linux/module.h>
MODULE_LICENSE("GPL");
static void exploit_skb_free(void) { / ... / }
module_init(exploit_skb_free);
Mitigation Steps:
1. Patch immediately with kernel updates.
2. Disable vulnerable modules:
sudo rmmod nf_tables
3. Restrict kernel memory access:
echo 1 > /proc/sys/kernel/kptr_restrict
Detection Script:
!/bin/bash if uname -r | grep -q "5.1[4-9]|6.[0-6]"; then echo "Vulnerable kernel detected. Apply patches." fi
Debugging:
Check kernel logs for UAF traces:
dmesg | grep "netfilter|use-after-free"
Exploit Analysis:
- Heap Feng Shui required for reliable exploitation.
- KASLR/SMEP bypass possible via corrupted function pointers.
References:
End of Report.
Sources:
Reported By: www.cve.org
Extra Source Hub:
Undercode
