CVE-2022-49114
📋 TL;DR
This is a use-after-free vulnerability in the Linux kernel's Fibre Channel SCSI subsystem. An attacker could potentially cause a kernel crash or execute arbitrary code with kernel privileges. Systems running vulnerable Linux kernel versions with Fibre Channel support are affected.
💻 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
Kernel panic leading to system crash, or potential privilege escalation to kernel-level code execution allowing full system compromise.
Likely Case
Kernel crash causing system instability or denial of service, requiring reboot to restore functionality.
If Mitigated
Limited impact if Fibre Channel is not configured or used, with potential for system instability if triggered.
🎯 Exploit Status
Exploitation requires triggering specific Fibre Channel SCSI exchange abort responses. Likely requires access to FC network or ability to send crafted FC packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the fix commits (1d7effe5fff9d28e45e18ac3a564067c7ddfe898 and related)
Vendor Advisory: https://git.kernel.org/stable/c/1d7effe5fff9d28e45e18ac3a564067c7ddfe898
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable Fibre Channel module
linuxIf Fibre Channel is not needed, blacklist or disable the FC modules
echo 'blacklist libfc' >> /etc/modprobe.d/blacklist.conf
rmmod libfc
🧯 If You Can't Patch
- Restrict access to Fibre Channel network to trusted systems only
- Implement network segmentation to isolate FC traffic from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if libfc module is loaded: 'uname -r' and 'lsmod | grep libfc'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and no longer vulnerable by checking against distribution security advisories📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/messages or dmesg
- SCSI/FC error messages related to exchange handling
Network Indicators:
- Unusual Fibre Channel traffic patterns or malformed FC packets
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "libfc" OR "fc_exch")🔗 References
- https://git.kernel.org/stable/c/1d7effe5fff9d28e45e18ac3a564067c7ddfe898
- https://git.kernel.org/stable/c/271add11994ba1a334859069367e04d2be2ebdd4
- https://git.kernel.org/stable/c/412dd8299b02e4410fe77b8396953c1a8dde183a
- https://git.kernel.org/stable/c/499d198494e77b6533251b9b909baf5c101129cb
- https://git.kernel.org/stable/c/4a131d4ea8b581ac9b01d3a72754db4848be3232
- https://git.kernel.org/stable/c/5cf2ce8967b0d98c8cfa4dc42ef4fcf080f5c836
- https://git.kernel.org/stable/c/6044ad64f41c87382cfeeca281573d1886d80cbe
- https://git.kernel.org/stable/c/87909291762d08fdb60d19069d7a89b5b308d0ef
- https://git.kernel.org/stable/c/f581df412bc45c95176e3c808ee2839c05b2ab0c
