File corruption via incomplete clone-range cache invalidation
Published Oct 18, 2026 · Updated Oct 18, 2026
Data corruption in the Linux SMB client allows local users to expose cached bytes when a clone operation extends a file. The cifs_remap_file_range() function invalidates only the destination region, leaving the cache folio crossing the old end of file intact and making bytes dirtied past EOF through mmap visible after extension. Triggering requires access to a mounted SMB file for memory-mapped writes and a size-extending clone; the documented consequence is incorrect file content, not arbitrary kernel-memory disclosure.
Summary
What happened
Data corruption in the Linux SMB client allows local users to expose cached bytes when a clone operation extends a file. The cifs_remap_file_range() function invalidates only the destination region, leaving the cache folio crossing the old end of file intact and making bytes dirtied past EOF through mmap visible after extension. Triggering requires access to a mounted SMB file for memory-mapped writes and a size-extending clone; the documented consequence is incorrect file content, not arbitrary kernel-memory disclosure.
The record
- CVE
- CVE-2026-98685
- Published
- Oct 18, 2026
- Updated
- Oct 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 18, 2026CVE publishedPublication date reported by the CVE source.
- Oct 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=358bd5f436d820bb758833050aae065b35d6986c
- Affected versionversion=43801359c8971cc49b4a4db5015fba77fbd09c32
- Affected versionversion=6.1.68 <6.2
- Affected versionversion=6.6.7 <6.7
- Affected versionversion=6.7
- Affected versionversion=c54fc3a4f375663f2361a9cbb2955fb4ef912879 <15bb9f1d3e967e328649e92a1451e60a0dc66118
- Affected versionversion=c54fc3a4f375663f2361a9cbb2955fb4ef912879 <4721587f96cb8de8164f3fd203093a0875560999
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
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