CVE-2023-53244
📋 TL;DR
This vulnerability in the Linux kernel's tw68 media driver allows a null pointer dereference when DMA memory allocation fails during buffer preparation. If exploited, it could cause kernel crashes or potentially allow local privilege escalation. Systems using the tw68 PCI media capture cards with affected kernel versions are vulnerable.
💻 Affected Systems
- Linux kernel with tw68 media driver
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash, or potential local privilege escalation allowing attackers to gain root access.
Likely Case
Kernel crash or system instability when the driver fails to allocate DMA memory, requiring system reboot.
If Mitigated
System remains stable with proper kernel protections and memory allocation safeguards.
🎯 Exploit Status
Requires local access and ability to trigger DMA allocation failures in the tw68 driver. Similar vulnerabilities have been dynamically triggered from user space.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel versions containing commits: 1634b7adcc5bef645b3666fdd564e5952a9e24e0, 3715c5e9a8f96b6ed0dcbea06da443efccac1ecc, 3c67f49a6643d973e83968ea35806c7b5ae68b56, dcf632bca424e6ff8c8eb89c96694e7f05cd29b6
Vendor Advisory: https://git.kernel.org/stable/c/1634b7adcc5bef645b3666fdd564e5952a9e24e0
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. For distributions: Use package manager to update kernel package. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable tw68 driver
linuxPrevent loading of the vulnerable tw68 media driver
echo 'blacklist tw68' >> /etc/modprobe.d/blacklist.conf
rmmod tw68
🧯 If You Can't Patch
- Restrict local user access to systems with tw68 hardware
- Implement kernel hardening features like KASLR and memory protection
🔍 How to Verify
Check if Vulnerable:
Check if tw68 module is loaded: lsmod | grep tw68. Check kernel version against affected ranges.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits. Check dmesg for tw68 driver errors after patch.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- NULL pointer dereference errors in dmesg
- tw68 driver crash logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("NULL pointer dereference" OR "tw68" OR "kernel panic")