{"id":"CVE-2026-98125","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix stale page cache in insert/collapse range\n\nsmb3_insert_range() and smb3_collapse_range() use\ntruncate_pagecache_range() to invalidate the affected page …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix stale page cache in insert/collapse range\n\nsmb3_insert_range() and smb3_collapse_range() use\ntruncate_pagecache_range() to invalidate the affected page …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 < 76222e76d08fbae4092ee9da84ded2b4c24ee598","Linux >= fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 < 01261a6fa48b62f5ead8e88aaca1e27cb9ab9032","Linux 49523a4732204bdacbf3941a016503ddb4ddb3b9","Linux 0cdde8460c304283d4ebe3f767a70215d1ab9d4e","Linux >= 5.19.12 < 5.20","Linux 6.0"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:43.827","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98125","references":[{"url":"https://git.kernel.org/stable/c/01261a6fa48b62f5ead8e88aaca1e27cb9ab9032","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76222e76d08fbae4092ee9da84ded2b4c24ee598","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.819Z","slug":"CVE-2026-98125","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix stale page cache in insert/collapse range\n\nsmb3_insert_range() and smb3_collapse_range() use\ntruncate_pagecache_range() to invalidate the affected page cache.\nHowever, if off or old_eof is not page-aligned, the boundary pages are\nonly partially zeroed and remain uptodate. As a result, the client may\nreturn stale data after a successful insert/collapse range operation.\n\nFor example, with 4K pages:\n\n    page 0          page 1          page 2\n    0------4K       4K------8K      8K------12K\n       ^                                ^\n    off=2K                       old_eof=10K\n\nPage 1 is removed from the page cache, while the boundary pages are\nonly partially zeroed. After COPYCHUNK moves the data on the server,\nthese cached pages may still return stale data.\n\nThis can be reproduced on a CIFS mount:\n\n    bash -c '\n            FILE=/mnt/scratch/repro\n\n            # Use a 6 KiB file so EOF is not page-aligned.\n            dd if=/dev/urandom of=/tmp/src bs=1K count=6 status=none\n\n            # Expected: a 4 KiB hole followed by the original data.\n            rm -f /tmp/expected\n            truncate -s 4K /tmp/expected\n            cat /tmp/src >> /tmp/expected\n\n            cp /tmp/src \"$FILE\"\n\n            # Prime the page cache before moving data on the server.\n            cat \"$FILE\" > /dev/null\n\n            fallocate --insert-range -o 0 -l 4K \"$FILE\"\n\n            if cmp -s /tmp/expected \"$FILE\"; then\n                    echo \"readback: OK\"\n            else\n                    echo \"readback: STALE DATA\"\n            fi\n    '\n\nFix this by writing back dirty data and discarding the page cache from\nthe start of the page containing off to EOF before moving data on the\nserver.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}