CVE-2022-49633
📋 TL;DR
This CVE describes a race condition vulnerability in the Linux kernel's ICMP handling where concurrent access to the sysctl_icmp_echo_enable_probe variable could lead to inconsistent behavior. It affects Linux systems with ICMP echo probe functionality enabled. The vulnerability could potentially allow attackers to cause unexpected behavior in ICMP handling.
💻 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 →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
An attacker could potentially cause kernel instability or denial of service by exploiting the race condition during ICMP echo probe operations, leading to system crashes or unpredictable network behavior.
Likely Case
Inconsistent ICMP echo probe behavior causing minor network anomalies or failed probe responses, but unlikely to lead to system compromise.
If Mitigated
With proper kernel patches applied, the race condition is eliminated and ICMP echo probe operations function correctly with proper synchronization.
🎯 Exploit Status
Exploitation requires precise timing to trigger the race condition and would likely only cause minor ICMP handling anomalies rather than system compromise
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits: 05c615033174f1d19374f42285ccd8e9af13e427, 4a2f7083cc6cb72dade9a63699ca352fad26d1cd, cce955efa0ab81f7fb72e22beed372054c86005c)
Vendor Advisory: https://git.kernel.org/stable/c/05c615033174f1d19374f42285ccd8e9af13e427
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable ICMP echo probe functionality
linuxDisable the vulnerable ICMP echo probe feature by setting sysctl_icmp_echo_enable_probe to 0
echo 0 > /proc/sys/net/ipv4/icmp_echo_enable_probe
sysctl -w net.ipv4.icmp_echo_enable_probe=0
🧯 If You Can't Patch
- Apply workaround to disable ICMP echo probe functionality
- Implement network segmentation to limit ICMP traffic to vulnerable systems
🔍 How to Verify
Check if Vulnerable:
Check if ICMP echo probe is enabled: cat /proc/sys/net/ipv4/icmp_echo_enable_probeCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and ICMP echo probe functionality works correctly if enabled📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing ICMP handling anomalies
- System logs with network stack errors
Network Indicators:
- Unusual ICMP echo probe response patterns
- Inconsistent ICMP behavior
SIEM Query:
Search for kernel logs containing 'icmp' or 'echo_enable_probe' errors