ext4: fix transaction overflow during writeback

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Summary

CVECVE-2026-100073
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 14:17:13 UTC
Updated2026-09-30 14:10:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: fix transaction overflow during writeback Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent conversion") was correct to note that we need to reserve enough credits for all extents possibly underlying a large folio. However it was too eager to reduce the number of reserved credits. Extent conversion may not only need to touch several leaf extent blocks, it may also need to split extents - for example a single large unwritten extent may need to be split into many small written ones in case of sparse folio dirtying. This can thus result not only in extent leaf modifications but also in a need to allocate new extent tree nodes. As a result the reserved transaction credits were not sufficient in some corner cases. Use ext4_meta_trans_blocks() for correct upper bound credit estimate.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.031630000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 95ad8ee45cdbc321c135a2db895d48b374ef0f87 a22464c5df5827e884a5a7d3d8fb03870e5bb6c8 git Not specified
CNA Linux Linux affected 95ad8ee45cdbc321c135a2db895d48b374ef0f87 46e8e31771f4f1c5e1cdec37a889a6730e42e9f1 git Not specified
CNA Linux Linux affected 2b6d39229bc783198222cddd31e2fbded93c8db7 git Not specified
CNA Linux Linux affected 6.16.3 6.17 semver Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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