CVE-2025-39690
📋 TL;DR
This CVE involves an uninitialized memory vulnerability in the Linux kernel's SCA3300 accelerometer driver. It could allow attackers to read uninitialized kernel stack data, potentially leaking sensitive information. Systems using the affected iio:accel:sca3300 driver are vulnerable.
💻 Affected Systems
- Linux kernel with SCA3300 accelerometer 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 memory disclosure revealing sensitive information like encryption keys, passwords, or other process data from kernel memory
Likely Case
Limited information disclosure of uninitialized stack data, potentially revealing some kernel memory contents
If Mitigated
No information disclosure with proper kernel hardening and access controls
🎯 Exploit Status
Requires local access and ability to interact with the iio subsystem. Exploitation depends on specific hardware configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 4e5b705cc6147f0b9173c6219079f41416bdd3c0 or c88c04adb8611e436e1e773fd5db3f8d7397d089
Vendor Advisory: https://git.kernel.org/stable/c/4e5b705cc6147f0b9173c6219079f41416bdd3c0
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify driver is no longer vulnerable.
🔧 Temporary Workarounds
Disable SCA3300 driver
allPrevent loading of the vulnerable driver module
echo 'blacklist sca3300' >> /etc/modprobe.d/blacklist.conf
rmmod sca3300
🧯 If You Can't Patch
- Restrict access to iio device files to trusted users only
- Implement strict kernel hardening measures and disable unnecessary drivers
🔍 How to Verify
Check if Vulnerable:
Check if sca3300 driver is loaded: lsmod | grep sca3300. Check kernel version: uname -r and compare with patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits. Check /proc/config.gz or kernel source for CONFIG_IIO_ACCEL_SCA3300 and ensure running patched kernel.📡 Detection & Monitoring
Log Indicators:
- Unusual iio subsystem access patterns
- Multiple failed attempts to read from accelerometer devices
Network Indicators:
- None - local vulnerability only
SIEM Query:
process.name = "*" AND file.path = "/sys/bus/iio/devices/*" AND event.action = "read"