smb/client: fix stale page cache in insert/collapse range

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98125
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:43 UTC
Updated2026-09-25 11:17:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb/client: fix stale page cache in insert/collapse range smb3_insert_range() and smb3_collapse_range() use truncate_pagecache_range() to invalidate the affected page cache. However, if off or old_eof is not page-aligned, the boundary pages are only partially zeroed and remain uptodate. As a result, the client may return stale data after a successful insert/collapse range operation. For example, with 4K pages: page 0 page 1 page 2 0------4K 4K------8K 8K------12K ^ ^ off=2K old_eof=10K Page 1 is removed from the page cache, while the boundary pages are only partially zeroed. After COPYCHUNK moves the data on the server, these cached pages may still return stale data. This can be reproduced on a CIFS mount: bash -c ' FILE=/mnt/scratch/repro # Use a 6 KiB file so EOF is not page-aligned. dd if=/dev/urandom of=/tmp/src bs=1K count=6 status=none # Expected: a 4 KiB hole followed by the original data. rm -f /tmp/expected truncate -s 4K /tmp/expected cat /tmp/src >> /tmp/expected cp /tmp/src "$FILE" # Prime the page cache before moving data on the server. cat "$FILE" > /dev/null fallocate --insert-range -o 0 -l 4K "$FILE" if cmp -s /tmp/expected "$FILE"; then echo "readback: OK" else echo "readback: STALE DATA" fi ' Fix this by writing back dirty data and discarding the page cache from the start of the page containing off to EOF before moving data on the server.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 76222e76d08fbae4092ee9da84ded2b4c24ee598 git Not specified
CNA Linux Linux affected fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 01261a6fa48b62f5ead8e88aaca1e27cb9ab9032 git Not specified
CNA Linux Linux affected 49523a4732204bdacbf3941a016503ddb4ddb3b9 git Not specified
CNA Linux Linux affected 0cdde8460c304283d4ebe3f767a70215d1ab9d4e git Not specified
CNA Linux Linux affected 5.19.12 5.20 semver Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/76222e76d08fbae4092ee9da84ded2b4c24ee598 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01261a6fa48b62f5ead8e88aaca1e27cb9ab9032 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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