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CVE-2026-99213VulnerabilityPublished

Microsoft · vsock: treat TCP_CLOSING as once-established

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99213· High

Not known to be exploited · fixed in c2c5359ef2c33684fa3f3652fd761a483db8d1e7 : patch Microsoft soon.

Data as of 29 Oct 2026, 11:32 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in c2c5359ef2c33684fa3f3652fd761a483db8d1e7, 44d1ca05d6094a5d75c671a0545249186d790b8d, 4f6ac74fa594a918d41255c941256e1d51592d3b

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 Linux to c2c5359ef2c33684fa3f3652fd761a483db8d1e7, 44d1ca05d6094a5d75c671a0545249186d790b8d or 4f6ac74fa594a918d41255c941256e1d51592d3b.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < c2c5359ef2c33684fa3f3652fd761a483db8d1e7
Fixed in
  • c2c5359ef2c33684fa3f3652fd761a483db8d1e7
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 44d1ca05d6094a5d75c671a0545249186d790b8d
Fixed in
  • 44d1ca05d6094a5d75c671a0545249186d790b8d
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 4f6ac74fa594a918d41255c941256e1d51592d3b
Fixed in
  • 4f6ac74fa594a918d41255c941256e1d51592d3b
LinuxLinuxAffected
  • =3.9
Fixed in–

Description

CVE-2026-99213 is a vulnerability related to the handling of the TCP_CLOSING state in the vsock component of Microsoft software version 3.0. The description and technical details are minimal, and no CVSS score or detailed impact information is provided.

References

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