CVE-2026-98685
Received
Received - Intake
SMB Client File Extension Pagecache Exposure in Linux Kernel
Vulnerability report for CVE-2026-98685, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | c54fc3a4f375663f2361a9cbb2955fb4ef912879 |
| Linux | Linux | c54fc3a4f375663f2361a9cbb2955fb4ef912879 |
| Linux | Linux | 358bd5f436d820bb758833050aae065b35d6986c |
| Linux | Linux | 43801359c8971cc49b4a4db5015fba77fbd09c32 |
| Linux | Linux | 6.1.68 |
| Linux | Linux | 6.6.7 |
| Linux | Linux | 6.7 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
