Microsoft · vsock: treat TCP_CLOSING as once-established
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in c2c5359ef2c33684fa3f3652fd761a483db8d1e7 : patch Microsoft soon.
Data as of 29 Oct 2026, 11:32 UTC
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
Disclosed: evidence found.
CVE published 28 Oct 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 29 Oct 2026.
What to do
Upgrade Linux to c2c5359ef2c33684fa3f3652fd761a483db8d1e7, 44d1ca05d6094a5d75c671a0545249186d790b8d or 4f6ac74fa594a918d41255c941256e1d51592d3b.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| 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.