CVE-2024-27396

Q: What is the severity of CVE-2024-27396?

CVE-2024-27396 has a CVSS score of 7.8 (HIGH). This CVE describes a use-after-free vulnerability in the Linux kernel's GTP (GPRS Tunneling Protocol) implementation. Attackers could potentially exploit this to cause kernel crashes or execute arbitrary code with kernel privileges. Systems running vulnerable Linux kernel versions with GTP functionality enabled are affected.

7.8 HIGH

Denial of Service

📋 TL;DR

This CVE describes a use-after-free vulnerability in the Linux kernel's GTP (GPRS Tunneling Protocol) implementation. Attackers could potentially exploit this to cause kernel crashes or execute arbitrary code with kernel privileges. Systems running vulnerable Linux kernel versions with GTP functionality enabled are affected.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific vulnerable versions not explicitly stated in CVE description; check kernel commit references for exact affected versions.

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable if GTP (GPRS Tunneling Protocol) functionality is enabled and configured. Many systems don't use GTP by default.

📦 What is this software?

Debian Linux by Debian

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Linux Kernel by Linux

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Kernel panic leading to system crash or potential arbitrary code execution with kernel privileges, resulting in complete system compromise.

🟠

Likely Case

Kernel crash causing denial of service, potentially requiring system reboot to restore functionality.

🟢

If Mitigated

Minimal impact if GTP functionality is disabled or systems are properly segmented.

🌐 Internet-Facing: MEDIUM - Requires GTP functionality to be enabled and accessible, which is less common than other network services.

🏢 Internal Only: MEDIUM - Internal systems with GTP enabled could be targeted by internal attackers or compromised systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Exploitation requires access to GTP functionality and knowledge of kernel exploitation techniques. The vulnerability is in a specific subsystem (GTP) that may not be widely enabled.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check kernel commit references for specific patched versions (e.g., 07b20d0a3dc13fb1adff10b60021a4924498da58)

Vendor Advisory: https://git.kernel.org/stable/c/07b20d0a3dc13fb1adff10b60021a4924498da58

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from official kernel repository or distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.

🔧 Temporary Workarounds

Disable GTP functionality

linux

Remove or disable GTP kernel module if not required

modprobe -r gtp
echo 'blacklist gtp' >> /etc/modprobe.d/blacklist.conf

🧯 If You Can't Patch

Disable GTP functionality if not required for operations
Implement network segmentation to isolate systems with GTP enabled

🔍 How to Verify

Check if Vulnerable:

Check if GTP module is loaded: lsmod | grep gtp. If loaded and kernel version is vulnerable, system is at risk.

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated to patched version and GTP module is either not loaded or updated.

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
OOPs (Out Of Memory) errors related to GTP or network subsystem
System crash/reboot logs

Network Indicators:

Unusual GTP protocol traffic patterns
Connection attempts to GTP ports (default 2123, 2152 UDP)

SIEM Query:

source="kernel" AND ("GTP" OR "use-after-free" OR "kernel panic")

📊 Metadata

CVE ID: CVE-2024-27396

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-416

Published: May 14, 2024

Last Updated: January 14, 2025

📋 TL;DR

💻 Affected Systems

📦 What is this software?

Debian Linux by Debian

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

Linux Kernel by Linux

⚠️ Risk & Real-World Impact

Worst Case

Likely Case

If Mitigated

🎯 Exploit Status

🛠️ Fix & Mitigation

✅ Official Fix

Instructions:

🔧 Temporary Workarounds

Disable GTP functionality

🧯 If You Can't Patch

🔍 How to Verify

Check if Vulnerable:

Check Version:

Verify Fix Applied:

📡 Detection & Monitoring

Log Indicators:

Network Indicators:

SIEM Query:

📊 Metadata

🔗 References

📤 Share & Export

🔗 Related Vulnerabilities