CVE-2022-49053
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's SCSI target subsystem (tcmu). Attackers with local access could potentially exploit this to cause kernel crashes, memory corruption, or execute arbitrary code. Systems running vulnerable Linux kernel versions with SCSI target functionality enabled 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise, kernel panic causing denial of service, or arbitrary code execution with kernel privileges.
Likely Case
Kernel crash leading to system instability or denial of service, potentially allowing information disclosure through memory corruption.
If Mitigated
Limited to denial of service if exploit attempts are detected and contained by security controls.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory management. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the fix commits referenced in the CVE
Vendor Advisory: https://git.kernel.org/stable/c/a6968f7a367f128d120447360734344d5a3d5336
Restart Required: Yes
Instructions:
1. Update to a patched Linux kernel version from your distribution vendor. 2. Reboot the system to load the new kernel. 3. Verify the fix is applied by checking kernel version.
🔧 Temporary Workarounds
Disable tcmu module
allPrevent loading of the vulnerable SCSI target module if not required
echo 'blacklist tcmu' >> /etc/modprobe.d/blacklist-tcmu.conf
rmmod tcmu
🧯 If You Can't Patch
- Restrict local user access to minimize attack surface
- Implement kernel hardening features like SELinux/AppArmor to limit impact
🔍 How to Verify
Check if Vulnerable:
Check if tcmu module is loaded: lsmod | grep tcmu. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to a patched version and tcmu module version matches fixed commits.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages in /var/log/kern.log or dmesg
- System crashes or unexpected reboots
- SCSI target subsystem errors
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Search for kernel panic events, oops messages, or tcmu module related crashes in system logs🔗 References
- https://git.kernel.org/stable/c/a6968f7a367f128d120447360734344d5a3d5336
- https://git.kernel.org/stable/c/a9564d84ed9f6ee71017d062d0d2182154294a4b
- https://git.kernel.org/stable/c/aec36b98a1bbaa84bfd8299a306e4c12314af626
- https://git.kernel.org/stable/c/b7f3b5d70c834f49f7d87a2f2ed1c6284d9a0322
- https://git.kernel.org/stable/c/d7c5d79e50be6e06b669141e3db1f977a0dd4e8e
- https://git.kernel.org/stable/c/e3e0e067d5b34e4a68e3cc55f8eebc413f56f8ed
- https://git.kernel.org/stable/c/fb7a5115422fbd6a4d505e8844f1ef5529f10489
