netfs: Fix potential deadlock in write-through mode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64062
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:46 UTC
Updated2026-07-19 16:17:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential deadlock in write-through mode Fix netfs_advance_writethrough() to always unlock the supplied folio and to mark it dirty if it isn't yet written to the end. Unfortunately, it can't be marked for writeback until the folio is done with as that may cause a deadlock against mmapped reads and writes. Even though it has been marked dirty, premature writeback can't occur as the caller is holding both inode->i_rwsem (which will prevent concurrent truncation, fallocation, DIO and other writes) and ictx->wb_lock (which will cause flushing to wait and writeback to skip or wait). Note that this may be easier to deal with once the queuing of folios is split from the generation of subrequests.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063780000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 1468f39243ccb155b6d97f9a9932f610d1205d75 git Not specified
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 003aa0dd26c964025acd6d1213bcdbd674db2ca9 git Not specified
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 e40e9cbf3ee4d30ee9a97bd128c85500b6ad0da1 git Not specified
CNA Linux Linux affected 288ace2f57c9d06dd2e42bd80d03747d879a4068 b6a4ae1634b3ad2aaa05222e53d36da532852faf git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b6a4ae1634b3ad2aaa05222e53d36da532852faf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/003aa0dd26c964025acd6d1213bcdbd674db2ca9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1468f39243ccb155b6d97f9a9932f610d1205d75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e40e9cbf3ee4d30ee9a97bd128c85500b6ad0da1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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