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Unrated severityNVD Advisory· Published Dec 24, 2025· Updated Apr 15, 2026

CVE-2025-68348

CVE-2025-68348

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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Affected products

43

Patches

Vulnerability mechanics

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