CVE-2024-39462
📋 TL;DR
This is a Linux kernel memory corruption vulnerability in the BCM2711 DVP clock driver where array bounds checking fails due to uninitialized counter variable. It allows attackers to potentially execute arbitrary code with kernel privileges. Systems running affected Linux kernel versions with the BCM2711 DVP clock driver loaded are vulnerable.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via kernel privilege escalation leading to root access, data theft, persistence installation, or complete system takeover.
Likely Case
Kernel panic or system crash causing denial of service, potentially leading to data corruption or system instability.
If Mitigated
No impact if kernel is patched or vulnerable driver not loaded; UBSAN warnings logged if bounds checking enabled.
🎯 Exploit Status
Requires local access to trigger; exploitation depends on memory layout and UBSAN configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel commits: 0dc913217fb79096597005bba9ba738e2db5cd02, 9368cdf90f52a68120d039887ccff74ff33b4444, a1dd92fca0d6b58b55ed0484f75d4205dbb77010
Vendor Advisory: https://git.kernel.org/stable/c/0dc913217fb79096597005bba9ba738e2db5cd02
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Rebuild kernel if compiling from source. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable vulnerable driver
linuxPrevent loading of clk-bcm2711-dvp driver if not needed
echo 'blacklist clk-bcm2711-dvp' >> /etc/modprobe.d/blacklist.conf
rmmod clk_bcm2711_dvp
Enable UBSAN protection
linuxEnable UndefinedBehaviorSanitizer to detect and prevent exploitation
Add 'CONFIG_UBSAN=y' to kernel configuration and rebuild
🧯 If You Can't Patch
- Restrict local user access to prevent privilege escalation attempts
- Implement strict kernel module signing to prevent unauthorized driver loading
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if clk-bcm2711-dvp driver is loaded: lsmod | grep clk_bcm2711_dvpCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits and driver loads without UBSAN warnings in dmesg📡 Detection & Monitoring
Log Indicators:
- UBSAN array-index-out-of-bounds warnings in kernel logs
- Kernel panic messages related to clk-bcm2711-dvp
Network Indicators:
- None - local exploitation only
SIEM Query:
source="kernel" AND "UBSAN" AND "array-index-out-of-bounds" AND "clk-bcm2711-dvp"🔗 References
- https://git.kernel.org/stable/c/0dc913217fb79096597005bba9ba738e2db5cd02
- https://git.kernel.org/stable/c/9368cdf90f52a68120d039887ccff74ff33b4444
- https://git.kernel.org/stable/c/a1dd92fca0d6b58b55ed0484f75d4205dbb77010
- https://git.kernel.org/stable/c/0dc913217fb79096597005bba9ba738e2db5cd02
- https://git.kernel.org/stable/c/9368cdf90f52a68120d039887ccff74ff33b4444
- https://git.kernel.org/stable/c/a1dd92fca0d6b58b55ed0484f75d4205dbb77010
