CVE-2025-38239
📋 TL;DR
This CVE describes an out-of-bounds array access vulnerability in the Linux kernel's megaraid_sas driver. When DRAM interleave is enabled, the driver can access memory outside its allocated bounds, potentially leading to system instability or kernel crashes. Systems using the megaraid_sas driver with DRAM interleave enabled are affected.
💻 Affected Systems
- Linux kernel with megaraid_sas 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 →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 panic leading to system crash, potential denial of service, or arbitrary code execution in kernel context.
Likely Case
System instability, kernel crashes, or denial of service affecting storage operations.
If Mitigated
Minor performance impact or no effect if the vulnerable code path is not triggered.
🎯 Exploit Status
Exploitation requires local access and specific system configuration (DRAM interleave enabled).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the fix commits listed in references
Vendor Advisory: https://git.kernel.org/stable/c/074efb35552556a4b3b25eedab076d5dc24a8199
Restart Required: Yes
Instructions:
1. Update Linux kernel to a version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify megaraid_sas driver is functioning correctly.
🔧 Temporary Workarounds
Disable DRAM interleave
linuxDisable DRAM interleave feature in BIOS/UEFI settings to prevent triggering the vulnerable code path
Blacklist megaraid_sas driver
linuxPrevent loading of the vulnerable driver module
echo 'blacklist megaraid_sas' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Disable DRAM interleave in system BIOS/UEFI settings
- Restrict local user access to systems using megaraid_sas driver
🔍 How to Verify
Check if Vulnerable:
Check if megaraid_sas driver is loaded: lsmod | grep megaraid_sas. Check kernel version: uname -r. Check if DRAM interleave is enabled in BIOS/UEFI.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to one containing fix commits. Check system logs for absence of UBSAN array-index-out-of-bounds errors related to megaraid_sas.📡 Detection & Monitoring
Log Indicators:
- UBSAN: array-index-out-of-bounds errors in kernel logs
- megaraid_sas driver crash messages
- kernel panic messages
Network Indicators:
- None - this is a local kernel vulnerability
SIEM Query:
source="kernel" AND ("UBSAN" OR "array-index-out-of-bounds" OR "megaraid_sas")🔗 References
- https://git.kernel.org/stable/c/074efb35552556a4b3b25eedab076d5dc24a8199
- https://git.kernel.org/stable/c/19a47c966deb36624843b7301f0373a3dc541a05
- https://git.kernel.org/stable/c/752eb816b55adb0673727ba0ed96609a17895654
- https://git.kernel.org/stable/c/bf2c1643abc3b2507d56bb6c22bf9897272f8a35
- https://git.kernel.org/stable/c/f1064b3532192e987ab17be7281d5fee36fd25e1
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
