VulnerabilityPublished 18 Oct 2026

CVE-2026-98683: Linux kernel · smb: client: flush dirty data before zeroing a range

Source GCVE Database

Authoritative record:CVE-2026-98683· Medium

Not known to be exploited · fixed in e8ba21c7e6ef3d4cb617858760673877b2e4a2bb : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e8ba21c7e6ef3d4cb617858760673877b2e4a2bb, cecf4114069fc19629d284710fd783d56bbca862, 8f8d32c1044f70e46e87550e039a15ff20a4b21c +3

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.

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What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.1.110 <6.2 >=6.6.51 <6.7 >=6.10.10 <6.11	Fixed in e8ba21c7e6ef3d4cb617858760673877b2e4a2bb cecf4114069fc19629d284710fd783d56bbca862 8f8d32c1044f70e46e87550e039a15ff20a4b21c 6.11 6.7 6.2
LinuxLinux	Affected =6.11	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to unconditionally flush dirty data before zeroing a range in the SMB client code. Users should apply the official kernel update containing this fix once available. Since this is a kernel-level vulnerability, upgrading to the patched kernel version is the recommended remediation. No alternative mitigations are indicated.

Description

A vulnerability in the Linux kernel's SMB client implementation was resolved involving improper flushing of dirty data before zeroing a file range. The smb3_zero_range() function failed to flush dirty data for zero ranges that did not reach the end of the file, potentially causing stale data to be written back after zeroing. This could lead to reading stale data where zeroed data is expected. The issue was fixed by ensuring unconditional flushing of dirty data before zeroing, aligning with similar fixes in related code paths.

Impact

The vulnerability could cause clients to read stale data from SMB shares when zeroing file ranges that do not extend to EOF. This undermines data integrity by allowing previously cached dirty data to overwrite zeroed regions, potentially leading to incorrect application behavior or data corruption when zeroed data is expected. There is no indication of remote code execution or privilege escalation. No known exploits in the wild have been reported.

References

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