Microsoft · vsock/virtio: validate packet source for connected sockets
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in e9bf92de436ba55f33eaa55d7008e68551123cfd : patch Microsoft soon.
Data as of 29 Oct 2026, 11:49 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in e9bf92de436ba55f33eaa55d7008e68551123cfd, dee44f41f206becb41c492899c1996cfd7f82a1b, 6cd829de69efd9ed3a53aa2421004a0396eb2bd7
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 e9bf92de436ba55f33eaa55d7008e68551123cfd, dee44f41f206becb41c492899c1996cfd7f82a1b or 6cd829de69efd9ed3a53aa2421004a0396eb2bd7.
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-2026-99123 is a vulnerability in Microsoft software related to vsock/virtio where packet source validation for connected sockets is addressed. The advisory provides no detailed technical information or impact description. The affected version explicitly stated is version 3.0.