CVE-2022-48948
📋 TL;DR
This CVE describes a buffer overflow vulnerability in the Linux kernel's USB gadget UVC driver. It allows attackers to write 4 bytes beyond the allocated buffer during USB control transfers, potentially leading to memory corruption. Systems using the UVC gadget driver (commonly for USB webcam emulation) 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 memory corruption leading to privilege escalation, denial of service, or arbitrary code execution in kernel context.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
Limited impact if UVC gadget functionality is disabled or not in use.
🎯 Exploit Status
Requires ability to send malicious USB control transfers to the UVC gadget interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 06fd17ee92c8f1704c7e54ec0fd50ae0542a49a5 or later
Vendor Advisory: https://git.kernel.org/stable/c/06fd17ee92c8f1704c7e54ec0fd50ae0542a49a5
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. For RHEL/CentOS: yum update kernel. 3. For Ubuntu/Debian: apt update && apt upgrade linux-image-*. 4. Reboot system.
🔧 Temporary Workarounds
Disable UVC gadget module
linuxPrevent loading of the vulnerable UVC gadget driver
echo 'blacklist g_webcam' >> /etc/modprobe.d/blacklist.conf
rmmod g_webcam
🧯 If You Can't Patch
- Disable USB gadget functionality if not required
- Restrict physical USB access and monitor for unauthorized USB devices
🔍 How to Verify
Check if Vulnerable:
Check if UVC gadget module is loaded: lsmod | grep g_webcam. If loaded and kernel version is unpatched, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Check kernel version includes fix commit: grep -q '06fd17ee92c8f1704c7e54ec0fd50ae0542a49a5' /proc/version_signature || uname -r📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes when using USB gadget functions
Network Indicators:
- Unusual USB-over-IP traffic patterns
SIEM Query:
source="kernel" AND ("Oops" OR "general protection fault") AND "uvc"🔗 References
- https://git.kernel.org/stable/c/06fd17ee92c8f1704c7e54ec0fd50ae0542a49a5
- https://git.kernel.org/stable/c/4972e3528b968665b596b5434764ff8fd9446d35
- https://git.kernel.org/stable/c/4c92670b16727365699fe4b19ed32013bab2c107
- https://git.kernel.org/stable/c/6b41a35b41f77821db24f2d8f66794b390a585c5
- https://git.kernel.org/stable/c/7b1f773277a72f9756d47a41b94e43506cce1954
- https://git.kernel.org/stable/c/b8fb1cba934ea122b50f13a4f9d6fc4fdc43d2be
- https://git.kernel.org/stable/c/bc8380fe5768c564f921f7b4eaba932e330b9e4b
- https://git.kernel.org/stable/c/c79538f32df12887f110dcd6b9c825b482905f24
- https://git.kernel.org/stable/c/d1a92bb8d697f170d93fe922da763d7d156b8841
