# CVE-2026-98685: smb: client: discard post-EOF pagecache when extending a file via clone range

CVE-2026-98685 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98685 (version 7.2.10-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98685
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98685

## Description

In the Linux kernel, the following vulnerability has been resolved:  smb: client: discard post-EOF pagecache when extending a file via clone range  cifs_remap_file_range() discarded the pagecache only for the folios overlapping the destination region, so when a clone extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended.  Start the discard at the smaller of fstart and the old EOF.  i_size is still old here, so nothing past the old EOF is flushed to the server.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.10-1 | [DEBIAN-CVE-2026-98685](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98685.md) | Oct 19, 2026 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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