VulnerabilityPublished 24 Sep 2026Updated 30 Oct 2026

CVE-2026-93794: Linux kernel · smb/client: flush dirty data before punching a hole

Source GCVE Database

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Authoritative record:CVE-2026-93794· Low

Not known to be exploited · fixed in d7d2adcd022baade5cab65ca492ce63421ce3a6e : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:53 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d7d2adcd022baade5cab65ca492ce63421ce3a6e, 39562a56cdb515f6635c3e7bfe6629439b18a169, 216e469586057c29409e4ef8311d282388c6e251 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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-5fcw-5g57-rhgg

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 31742c5a331766bc7df6b0d525df00c6cd20d5a6, < d7d2adcd022baade5cab65ca492ce63421ce3a6e	Fixed in d7d2adcd022baade5cab65ca492ce63421ce3a6e
LinuxLinux	Affected ≥ 31742c5a331766bc7df6b0d525df00c6cd20d5a6, < 39562a56cdb515f6635c3e7bfe6629439b18a169	Fixed in 39562a56cdb515f6635c3e7bfe6629439b18a169
LinuxLinux	Affected ≥ 31742c5a331766bc7df6b0d525df00c6cd20d5a6, < 216e469586057c29409e4ef8311d282388c6e251	Fixed in 216e469586057c29409e4ef8311d282388c6e251
LinuxLinux	Affected ≥ 31742c5a331766bc7df6b0d525df00c6cd20d5a6, < 6c265aca08155e519a8f6f6071c59dff4f535f70	Fixed in 6c265aca08155e519a8f6f6071c59dff4f535f70
LinuxLinux	Affected ≥ 31742c5a331766bc7df6b0d525df00c6cd20d5a6, < 0c9fcab9bf1ef3516983f3de05a19c5658c7a01e	Fixed in 0c9fcab9bf1ef3516983f3de05a19c5658c7a01e
LinuxLinux	Affected =3.17	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to flush dirty data before punching a hole in the file. Users should apply the official kernel update containing this fix once available. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's SMB client handling could cause file hole punching operations to incorrectly report data ranges. Specifically, after a large buffered write, punching a hole in a file may leave the range reported as data instead of a hole due to dirty data not being flushed properly before the hole is punched. This issue has been resolved by ensuring dirty data in the punched range is flushed and waited on before invalidating the page cache and issuing the zero data operation.

References

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