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CVE-2026-99123VulnerabilityPublished

Microsoft · vsock/virtio: validate packet source for connected sockets

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99123· High

Not known to be exploited · fixed in e9bf92de436ba55f33eaa55d7008e68551123cfd : patch Microsoft soon.

Data as of 29 Oct 2026, 11:49 UTC

Severity
High

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

  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 e9bf92de436ba55f33eaa55d7008e68551123cfd, dee44f41f206becb41c492899c1996cfd7f82a1b or 6cd829de69efd9ed3a53aa2421004a0396eb2bd7.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 06a8fc78367d070720af960dcecec917d3ae5f3b, < e9bf92de436ba55f33eaa55d7008e68551123cfd
Fixed in
  • e9bf92de436ba55f33eaa55d7008e68551123cfd
LinuxLinuxAffected
  • ≥ 06a8fc78367d070720af960dcecec917d3ae5f3b, < dee44f41f206becb41c492899c1996cfd7f82a1b
Fixed in
  • dee44f41f206becb41c492899c1996cfd7f82a1b
LinuxLinuxAffected
  • ≥ 06a8fc78367d070720af960dcecec917d3ae5f3b, < 6cd829de69efd9ed3a53aa2421004a0396eb2bd7
Fixed in
  • 6cd829de69efd9ed3a53aa2421004a0396eb2bd7
LinuxLinuxAffected
  • =4.8
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.

References

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