CVE-2024-42294
📋 TL;DR
A deadlock vulnerability in the Linux kernel's block subsystem allows concurrent execution of sd_remove and sd_release functions to cause system hangs. This affects Linux systems with SCSI storage devices, potentially leading to denial of service during device removal operations.
💻 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
System becomes completely unresponsive requiring hard reboot, potentially causing data corruption or loss during storage operations.
Likely Case
System hangs during USB storage device removal or SCSI device operations, requiring manual intervention to recover.
If Mitigated
Minor performance impact during device removal with proper kernel patching.
🎯 Exploit Status
Exploitation requires specific timing conditions during device removal operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel branches via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/5a5625a83eac91fdff1d5f0202ecfc45a31983c9
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Avoid concurrent device operations
linuxPrevent simultaneous device removal and release operations
🧯 If You Can't Patch
- Avoid hot-plugging SCSI/USB storage devices during active I/O operations
- Implement monitoring for hung tasks and automate recovery procedures
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with patched versions from kernel git repositoryCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes commit 5a5625a83eac91fdff1d5f0202ecfc45a31983c9 or related fixes📡 Detection & Monitoring
Log Indicators:
- 'blocked for more than' messages in kernel logs
- Hung task warnings related to sd_remove/sd_release
SIEM Query:
kernel_log: "blocked for more than" AND ("sd_remove" OR "sd_release")