CVE-2025-39935
📋 TL;DR
This CVE describes a memory corruption vulnerability in the Linux kernel's SMA1307 audio codec driver. An attacker could exploit this to cause kernel crashes or potentially execute arbitrary code with kernel privileges. This affects Linux systems using the affected SMA1307 driver.
💻 Affected Systems
- Linux kernel with SMA1307 audio codec 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 privilege escalation leading to full system compromise, denial of service, or arbitrary code execution at kernel level.
Likely Case
Kernel panic or system crash causing denial of service, potentially requiring physical access or reboot to restore functionality.
If Mitigated
Limited impact if system has kernel hardening features like KASLR, SMAP, and SMEP enabled, though crashes may still occur.
🎯 Exploit Status
Exploitation requires local access and ability to trigger the vulnerable code path in the SMA1307 driver. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 78338108b5a856dc98223a335f147846a8a18c51 and cd59ca8f75dbb42a67fcae975c766114644e36c4
Vendor Advisory: https://git.kernel.org/stable/c/78338108b5a856dc98223a335f147846a8a18c51
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check with your distribution for kernel security updates. 3. Reboot system after kernel update. 4. Verify driver is no longer vulnerable.
🔧 Temporary Workarounds
Disable SMA1307 driver
linuxPrevent loading of vulnerable SMA1307 audio codec driver
echo 'blacklist snd-soc-sma1307' >> /etc/modprobe.d/blacklist-sma1307.conf
update-initramfs -u
reboot
Kernel hardening
linuxEnable kernel security features to reduce impact
Add kernel parameters: slab_nomerge slub_debug=FZ init_on_alloc=1 init_on_free=1
Ensure CONFIG_SLAB_FREELIST_HARDENED=y in kernel config
🧯 If You Can't Patch
- Restrict local access to affected systems to trusted users only
- Implement strict privilege separation and limit user capabilities
🔍 How to Verify
Check if Vulnerable:
Check if SMA1307 driver is loaded: lsmod | grep sma1307 AND check kernel version against patched versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits: grep -q '78338108b5a856dc98223a335f147846a8a18c51\|cd59ca8f75dbb42a67fcae975c766114644e36c4' /proc/version_signature📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes/panics
- dmesg errors related to SMA1307 or memory corruption
Network Indicators:
- None - local vulnerability
SIEM Query:
source="kernel" AND ("sma1307" OR "general protection fault" OR "kernel panic")