CVE-2025-68348
Unknown Unknown - Not Provided
Memory Leak in Linux Kernel blkdev Zero Pages Handling

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: block: fix memory leak in __blkdev_issue_zero_pages Move the fatal signal check before bio_alloc() to prevent a memory leak when BLKDEV_ZERO_KILLABLE is set and a fatal signal is pending. Previously, the bio was allocated before checking for a fatal signal. If a signal was pending, the code would break out of the loop without freeing or chaining the just-allocated bio, causing a memory leak. This matches the pattern already used in __blkdev_issue_write_zeroes() where the signal check precedes the allocation.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-06-16
AI Q&A
2025-12-24
EPSS Evaluated
2026-06-15
NVD
CVE-2025-68348
EUVD
EUVD-2025-205106
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a memory leak in the Linux kernel's block device code, specifically in the __blkdev_issue_zero_pages function. The issue occurs because the code allocated memory for a bio structure before checking if a fatal signal was pending. If a fatal signal was pending, the function would exit without freeing the allocated memory, causing a memory leak. The fix moves the fatal signal check before the memory allocation to prevent this leak.

Impact Analysis

The memory leak caused by this vulnerability can lead to increased memory usage and potential resource exhaustion in the Linux kernel, which may degrade system performance or stability over time if the leak occurs repeatedly.

Mitigation Strategies

To mitigate this vulnerability, update your Linux kernel to the latest version where the fix for the memory leak in __blkdev_issue_zero_pages has been applied. This involves ensuring your system is patched with the kernel update that moves the fatal signal check before bio_alloc() to prevent the memory leak.

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