CVE-2026-98125

/// Technical description

In 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

/// Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// Affected products

/// References