CVE-2022-49278
📋 TL;DR
This CVE addresses an integer underflow vulnerability in the Linux kernel's remoteproc subsystem. If exploited, it could allow local attackers to cause denial of service or potentially execute arbitrary code. Systems running vulnerable Linux kernel versions with remoteproc functionality 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to kernel compromise and full system control
Likely Case
Kernel panic or system crash causing denial of service
If Mitigated
No impact if patch applied or remoteproc not in use
🎯 Exploit Status
Requires local access and knowledge of kernel exploitation techniques
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the fix commits listed in references
Vendor Advisory: https://git.kernel.org/stable/c/11572dad9fbadbd9269a2550f7e236b5b8c2d80c
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repository. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable remoteproc subsystem
LinuxIf not needed, disable the remoteproc functionality to eliminate attack surface
echo 'blacklist remoteproc' > /etc/modprobe.d/disable-remoteproc.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local access to trusted users only
- Implement strict privilege separation and least privilege principles
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if remoteproc modules are loaded: uname -r && lsmod | grep remoteprocCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and check if the specific git commit is included in your kernel📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes or unexpected reboots
- Remoteproc subsystem errors in dmesg
Network Indicators:
- None - local exploit only
SIEM Query:
search 'kernel: BUG:' OR 'kernel: Oops:' OR 'kernel: remoteproc' in system logs🔗 References
- https://git.kernel.org/stable/c/11572dad9fbadbd9269a2550f7e236b5b8c2d80c
- https://git.kernel.org/stable/c/34afac3c75fa08d6fabbab4c93f0a90618afaaa6
- https://git.kernel.org/stable/c/a8c3e53517985d69040a1b36a269e85f99cf0cea
- https://git.kernel.org/stable/c/b97b305656a7013690e7b6e310f0e827e0bbff90
- https://git.kernel.org/stable/c/f89672cc3681952f2d06314981a6b45f8b0045d1
