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CVE-2026-99122VulnerabilityPublished

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

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99122· Medium

Not known to be exploited · fixed in c027f8b429dbb2157fc1b503df196e272d947c89 : update Microsoft when convenient.

Data as of 29 Oct 2026, 11:49 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in c027f8b429dbb2157fc1b503df196e272d947c89, ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7, 90c423b62ec9be08177f74b07a47937ca8d2035b

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 c027f8b429dbb2157fc1b503df196e272d947c89, ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 or 90c423b62ec9be08177f74b07a47937ca8d2035b.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < c027f8b429dbb2157fc1b503df196e272d947c89
Fixed in
  • c027f8b429dbb2157fc1b503df196e272d947c89
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7
Fixed in
  • ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7
LinuxLinuxAffected
  • ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 90c423b62ec9be08177f74b07a47937ca8d2035b
Fixed in
  • 90c423b62ec9be08177f74b07a47937ca8d2035b
LinuxLinuxAffected
  • =3.9
Fixed in–

Description

CVE-2026-99122 is a vulnerability in Microsoft related to vsock/vmci where packet sources for connected sockets are not properly validated. The advisory does not provide detailed technical information or impact specifics. No CVSS score or exploit details are available.

References

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