netfs: Fix zeropoint update where i_size > remote_i_size

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Summary

CVECVE-2026-64159
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:57 UTC
Updated2026-07-19 16:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: Fix zeropoint update where i_size > remote_i_size Fix the update of the zero point[*] by netfs_release_folio() when there is uncommitted data in the pagecache beyond the folio being released but the on-server EOF is in this folio (ie. i_size > remote_i_size). The update needs to limit zero_point to remote_i_size, not i_size as i_size is a local phenomenon reflecting updates made locally to the pagecache, not stuff written to the server. remote_i_size tracks the server's i_size. [*] The zero point is the file position from which we can assume that the server will just return zeros, so we can avoid generating reads. Note that netfs_invalidate_folio() probably doesn't need fixing as zero_point should be updated by setattr after truncation or fallocate. Found with: fsx -q -N 1000000 -p 10000 -o 128000 -l 600000 \ /xfstest.test/junk --replay-ops=junk.fsxops using the following as junk.fsxops: truncate 0x0 0x1bbae 0x82864 write 0x3ef2e 0xf9c8 0x1bbae write 0x67e05 0xcb5a 0x4e8f6 mapread 0x57781 0x85b6 0x7495f copy_range 0x5d3d 0x10329 0x54fac 0x7495f write 0x64710 0x1c2b 0x7495f mapread 0x64000 0x1000 0x7495f on cifs with the default cache option. It shows read-gaps on folio 0x64 failing with a short read (ie. it hits EOF) if the FMODE_READ check is commented out in netfs_perform_write(): if (//(file->f_mode & FMODE_READ) || netfs_is_cache_enabled(ctx)) { and no fscache. This was initially found with the generic/522 xfstest.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cce6bfa6ca0e30af9927b0074c97fe6a92f28092 5cd5207de519ef0c085f4f559adf5eefcb4c5202 git Not specified
CNA Linux Linux affected cce6bfa6ca0e30af9927b0074c97fe6a92f28092 4543a4d737944134a1394afe797622546fbcc98a git Not specified
CNA Linux Linux affected e2814004138a541110d4b2dc254a8f619c2c4ce0 git Not specified
CNA Linux Linux affected 6.10.8 6.11 semver Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 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/5cd5207de519ef0c085f4f559adf5eefcb4c5202 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4543a4d737944134a1394afe797622546fbcc98a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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