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CVE-2026-99117VulnerabilityPublished

Microsoft · net: bridge: mcast: don't truncate the port group walk on teardown

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99117· High

Not known to be exploited · fixed in b45e8c24608c992d1e2cea047eb5bcbfa537f86b : 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 b45e8c24608c992d1e2cea047eb5bcbfa537f86b, 8243d587a081e790ad96e80d48eef44d9f7ef005, 5a3f7a683aee56e1f15c9d53041f3236767eaae7

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 b45e8c24608c992d1e2cea047eb5bcbfa537f86b, 8243d587a081e790ad96e80d48eef44d9f7ef005 or 5a3f7a683aee56e1f15c9d53041f3236767eaae7.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2, < b45e8c24608c992d1e2cea047eb5bcbfa537f86b
Fixed in
  • b45e8c24608c992d1e2cea047eb5bcbfa537f86b
LinuxLinuxAffected
  • ≥ b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2, < 8243d587a081e790ad96e80d48eef44d9f7ef005
Fixed in
  • 8243d587a081e790ad96e80d48eef44d9f7ef005
LinuxLinuxAffected
  • ≥ b08123684bd55fa6d6ee4b52d4ae3040fadb5aa2, < 5a3f7a683aee56e1f15c9d53041f3236767eaae7
Fixed in
  • 5a3f7a683aee56e1f15c9d53041f3236767eaae7
LinuxLinuxAffected
  • =5.10
Fixed in–

Description

CVE-2026-99117 is a vulnerability related to the network bridge multicast handling in Microsoft software version 3.0. The issue involves improper truncation of the port group walk during teardown, which may affect network operations. No detailed impact or exploitation information is provided.

References

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