CVE-2022-50200
📋 TL;DR
This CVE-2022-50200 is a memory boundary check vulnerability in the Linux kernel's SELinux put_entry() function that could allow local attackers to cause memory out-of-bounds access. It affects Linux systems with SELinux enabled, potentially leading to kernel crashes or privilege escalation. The vulnerability requires local access to exploit.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to denial of service, or potential privilege escalation to root if combined with other vulnerabilities.
Likely Case
Kernel crash causing system instability or denial of service on affected systems.
If Mitigated
Minimal impact with proper access controls and SELinux policies limiting user privileges.
🎯 Exploit Status
Requires local access and knowledge of SELinux internals. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/15ec76fb29be31df2bccb30fc09875274cba2776
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. For custom kernels, apply patches from provided git commits. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable SELinux
linuxTemporarily disable SELinux to mitigate vulnerability (not recommended for production)
setenforce 0
echo 0 > /sys/fs/selinux/enforce
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor system logs for kernel panic or SELinux-related errors
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if SELinux is enabled: uname -r && sestatusCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check git commit history for applied patches📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- SELinux audit logs with put_entry errors
- System crash dumps
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for 'kernel panic' or 'SELinux' error messages in system logs🔗 References
- https://git.kernel.org/stable/c/15ec76fb29be31df2bccb30fc09875274cba2776
- https://git.kernel.org/stable/c/2dabe6a872a5744865372eb30ea51e8ccd21305a
- https://git.kernel.org/stable/c/477722f31ad73aa779154d1d7e00825538389f76
- https://git.kernel.org/stable/c/7363a69d8ca8f0086f8e1196c8ddaf0e168614b1
- https://git.kernel.org/stable/c/90bdf50ae70c5571a277b5601e4f5df210831e0a
- https://git.kernel.org/stable/c/9605f50157cae00eb299e1189a6d708c84935ad8
- https://git.kernel.org/stable/c/adbfdaacde18faf6cd4e490764045375266b3fbd
- https://git.kernel.org/stable/c/dedd558d9765b72c66e5a53948e9f5abc3ece1f6
