VulnerabilityPublished 18 Oct 2026

CVE-2026-98682: Linux kernel · smb: client: drain and invalidate before server-side copy/clone

Source GCVE Database

Authoritative record:CVE-2026-98682· High

Not known to be exploited · fixed in dc71660f11ef2fecc0695a41e49cd496a9d255ab : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in dc71660f11ef2fecc0695a41e49cd496a9d255ab, c9b1194e8ec99d95db25db45edd2fbf690f043ab, 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-78hr-gpp6-3qpr

What to do

Upgrade Linux kernel to dc71660f11ef2fecc0695a41e49cd496a9d255ab, c9b1194e8ec99d95db25db45edd2fbf690f043ab, 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 dc71660f11ef2fecc0695a41e49cd496a9d255ab c9b1194e8ec99d95db25db45edd2fbf690f043ab 6.7 6.2
LinuxLinux	Affected =6.7	Fixed in–

AI-suggested

A fix is available that properly serializes the destination page cache by holding the invalidate_lock during flush and invalidation steps and draining outstanding I/O before issuing the server-side copy/clone ioctl. Users should apply the official Linux kernel update that addresses this issue. No additional mitigations are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's SMB client implementation related to server-side copy and clone operations could cause file corruption. The issue arises because the destination page cache is not properly serialized against server-side copy operations, allowing asynchronous writeback to overwrite newly copied data. This flaw has been fixed by ensuring proper locking and draining of in-flight I/O before issuing server-side copy or clone commands.

Impact

This vulnerability can cause file corruption on the client side when performing server-side copy or clone operations over SMB. The corruption occurs because stale data can overwrite the newly copied data due to improper synchronization of the page cache and outstanding I/O. There is no indication of remote code execution or privilege escalation. The impact is limited to data integrity loss in affected file operations.

References

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