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CVE-2026-99216VulnerabilityPublished

Microsoft · Drivers: hv: Don't reset VMBus connection state on error/exit paths

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99216· Medium

Not known to be exploited · fixed in f47ce27af80b87cc684d5c12b65506af498ac7e5 : update Microsoft when convenient.

Data as of 29 Oct 2026, 11:32 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f47ce27af80b87cc684d5c12b65506af498ac7e5, ec31dc39e835ccde0930daccece8c492d28282fc, 3195546a377c2d8d176d837e8baad5ce15d11195 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 29 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=4.19.118 <4.20
  • >=5.4.35 <5.5
  • >=5.6.7 <5.7
Fixed in
  • f47ce27af80b87cc684d5c12b65506af498ac7e5
  • ec31dc39e835ccde0930daccece8c492d28282fc
  • 3195546a377c2d8d176d837e8baad5ce15d11195
  • 5.7
  • 5.5
  • 4.20
LinuxLinuxAffected
  • =5.7
Fixed in–
Debiandebian/linuxpkg:deb/debian/linuxOther threatsAffected
  • >=4.19.118 <4.20
  • >=5.4.35 <5.5
  • >=5.6.7 <5.7
  • =5.7
Fixed in
  • 4.20
  • 5.5
  • 5.7

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This vulnerability involves the Microsoft driver component 'hv' where the VMBus connection state is improperly reset on error or exit paths. The issue is identified in version 3.0 of the affected software. No CVSS score or detailed impact information is provided.

References

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