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CVE-2026-23439VulnerabilityPublished Updated

Microsoft · udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 1 Nov 2026, 11:02 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Apr 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 24 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =2.0
Fixed in–

Description

This vulnerability involves a NULL pointer dereference caused by the function udp_sock_create6 when the CONFIG_IPV6 configuration is disabled (CONFIG_IPV6=n). It affects Microsoft software version 2.0. The issue may lead to application crashes or denial of service conditions due to improper handling of UDP socket creation in IPv6-disabled environments.

References

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