VulnerabilityPublished 18 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-98685· Medium

Not known to be exploited · fixed in 4721587f96cb8de8164f3fd203093a0875560999 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4721587f96cb8de8164f3fd203093a0875560999, 15bb9f1d3e967e328649e92a1451e60a0dc66118, 6.7 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-r85p-j355-crhr

What to do

Upgrade Linux kernel to 4721587f96cb8de8164f3fd203093a0875560999, 15bb9f1d3e967e328649e92a1451e60a0dc66118, 6.7 or 6.2.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.1.68 <6.2 >=6.6.7 <6.7	Fixed in 4721587f96cb8de8164f3fd203093a0875560999 15bb9f1d3e967e328649e92a1451e60a0dc66118 6.7 6.2
LinuxLinux	Affected =6.7	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly discard the pagecache overlapping the old EOF when extending a file via clone range. Users and administrators should apply the official kernel updates that include this fix. Patch status is not explicitly confirmed in the provided data; therefore, verify the vendor advisory or Linux kernel release notes for the exact fixed versions and apply updates accordingly.

Description

A vulnerability in the Linux kernel's SMB client was resolved involving improper discarding of the pagecache when extending a file via clone range. The issue caused the folio overlapping the old end-of-file (EOF) to retain data beyond the EOF, which could become visible as file content after the file was extended.

References

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