Linux Kernel Patch Plugs Resource Leak in Block Subsystem
CVE Notify recently brought to our attention a crucial fix in the Linux kernel, specifically addressing a resource leak within the blk_register_queue() error path. This vulnerability, tracked as CVE-2025-37980, highlights a common pitfall in software development: incomplete cleanup routines.
The issue arises when blk_mq_sysfs_register() successfully allocates resources, but a subsequent error in blk_register_queue() prevents the proper unregistration of these system filesystem resources. Without the necessary blk_mq_sysfs_unregister() call in the error handling path, these resources would persist, leading to a memory leak. This might seem minor, but over time, such leaks can degrade system performance and stability, especially in long-running or resource-intensive environments.
What This Means For You
- If your organization operates Linux-based systems, especially those with custom kernel modules or deeply integrated block devices, this fix is critical. A resource leak in the block subsystem, while not directly exploitable for arbitrary code execution in most scenarios, can lead to system instability, denial of service conditions, or even provide a subtle avenue for more complex attacks if memory exhaustion becomes a factor. Ensure your kernel versions are up-to-date or patched to include the fix for CVE-2025-37980 to maintain system integrity.
Related ATT&CK Techniques
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2025-37980 | Memory Leak | Linux kernel function blk_register_queue() error path |
| CVE-2025-37980 | Resource Leak | Missing blk_mq_sysfs_unregister() call in blk_register_queue() error path |
| CVE-2025-37980 | Affected Component | Linux kernel block subsystem |