CVE-2024-42238
📋 TL;DR
A buffer overflow vulnerability in the Linux kernel's Cirrus Logic CS_DSP firmware driver could allow local attackers to cause denial of service or potentially execute arbitrary code. The vulnerability occurs when processing firmware files with malformed block headers that exceed the remaining file data. Systems running affected Linux kernel versions with CS_DSP firmware support are vulnerable.
💻 Affected Systems
- Linux kernel with CS_DSP firmware 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
Local privilege escalation leading to kernel compromise and full system control
Likely Case
Kernel panic or system crash causing denial of service
If Mitigated
Failed firmware loading with error message, no system compromise
🎯 Exploit Status
Requires local access and ability to load malicious firmware. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commits 6eabd23383805725eff416c203688b7a390d4153, 90ab191b7d181057d71234e8632e06b5844ac38e, 959fe01e85b7241e3ec305d657febbe82da16a02, or b8be70566b33abbd0180105070b4c67cfef8c44f
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. For Debian LTS: Install kernel updates via apt. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Restrict firmware loading
linuxPrevent unauthorized users from loading firmware via kernel module restrictions
echo 'install cs_dsp /bin/false' >> /etc/modprobe.d/disable-cs_dsp.conf
rmmod cs_dsp 2>/dev/null
🧯 If You Can't Patch
- Restrict local access to systems - implement strict user privilege separation
- Monitor for unauthorized firmware loading attempts and kernel panic events
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if cs_dsp module is loaded: lsmod | grep cs_dsp && uname -rCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check dmesg for successful cs_dsp operations without errors📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- cs_dsp firmware loading errors in dmesg
- Failed firmware operations
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("cs_dsp" OR "firmware load error" OR "kernel panic")🔗 References
- https://git.kernel.org/stable/c/6eabd23383805725eff416c203688b7a390d4153
- https://git.kernel.org/stable/c/90ab191b7d181057d71234e8632e06b5844ac38e
- https://git.kernel.org/stable/c/959fe01e85b7241e3ec305d657febbe82da16a02
- https://git.kernel.org/stable/c/b8be70566b33abbd0180105070b4c67cfef8c44f
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
