f2fs: fix missing read bio submission on large folio error

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Summary

CVECVE-2026-63820
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:55 UTC
Updated2026-07-19 12:16:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: f2fs: fix missing read bio submission on large folio error f2fs_read_data_large_folio() can keep a read bio across multiple readahead folios. If a later folio hits an error before any of its blocks are added to the bio, folio_in_bio is false and the current error path returns immediately after ending that folio. This can leave the bio accumulated for earlier folios unsubmitted. Those folios then never receive read completion, and readers can wait indefinitely on the locked folios. Route errors through the common out path so any pending bio is submitted before returning. Stop consuming more readahead folios once an error is seen, and only wait on and clear the current folio when it was actually added to the bio.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.041950000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd 48c92559e7b66fdc3cbc74f6e152e66ec0150a0a git Not specified
CNA Linux Linux affected a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd 74c8d2ec95c59a5651ecd975c466998af1961fd4 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/48c92559e7b66fdc3cbc74f6e152e66ec0150a0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74c8d2ec95c59a5651ecd975c466998af1961fd4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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