netfs: zero gaps in read-gaps folio to avoid writing back stale data

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Summary

CVECVE-2026-98843
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:38 UTC
Updated2026-10-19 10:19:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: zero gaps in read-gaps folio to avoid writing back stale data netfs_read_gaps() leaves gaps around a streaming write's dirty region unread on the server side, so a short/EOF response there left stale folio content that later got written back. Zero it after the read completes, not before: netfs_wait_for_read() returns rreq->transferred once ret >= 0, so build an iterator over the same bvec array the read used, advance past ret, and zero the rest. The dirty region already maps to sink pages in that array rather than the real folio, so this can't touch it, and only the actual shortfall gets zeroed instead of the whole gap upfront.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ee4cdf7ba857a894ad1650d6ab77669cbbfa329e 512eaf01ffabf4258e945016b50df5aed940b705 git Not specified
CNA Linux Linux affected ee4cdf7ba857a894ad1650d6ab77669cbbfa329e 2a62fe628a877c249c8286b157ee99d82840d9dc git Not specified
CNA Linux Linux affected ee4cdf7ba857a894ad1650d6ab77669cbbfa329e 8db55c5cd831a786a1a2a2d391aa80354535a353 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2a62fe628a877c249c8286b157ee99d82840d9dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/512eaf01ffabf4258e945016b50df5aed940b705 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8db55c5cd831a786a1a2a2d391aa80354535a353 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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