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CVE-2024-26601 is a flaw in the Linux kernel ext4 filesystem's fast-commit replay handling. During replay, ext4 can attempt to free blocks that are already marked free. If block freeing fails in this condition, the buddy allocator bitmap can remain corrupted because its metadata is not regenerated. The fix restores regeneration of the ext4 buddy metadata after a failed block-freeing operation during fast-commit replay.
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Linux kernel ext4 fast-commit replay handling issue after failed block freeing.
Linux kernel ext4 filesystem flaw involving buddy regeneration following block-freeing failure during fast-commit replay.
Linux kernel ext4 filesystem flaw involving buddy regeneration after failed block freeing during fast-commit replay.
A Linux kernel ext4 filesystem flaw involving regeneration of buddy metadata when block freeing fails during fast-commit replay. The problematic change was introduced upstream in Linux v5.11; the upstream fix landed in v6.8. The content describes the impact as approximately moderate, though it notes uncertainty as to whether the issue constitutes a security flaw.
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