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Unrated severityNVD Advisory· Published Feb 24, 2024· Updated May 4, 2025

ext4: regenerate buddy after block freeing failed if under fc replay

CVE-2024-26601

Description

In the Linux kernel, the following vulnerability has been resolved:

ext4: regenerate buddy after block freeing failed if under fc replay

This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

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Affected products

146

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