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CVE-2026-45840VulnerabilityPublished Updated

Microsoft · openvswitch: cap upcall PID array size and pre-size vport replies

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 29 Oct 2026, 19:04 UTC

Severity
Medium

Rated by Threat Radar · 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 2 May 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

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • Microsoft
  • Azure Linux
  • 3.0
  • Azure Linux 3.0
  • kernel
Fixed in–

Description

CVE-2026-45840 is a vulnerability related to openvswitch involving cap upcall PID array size and pre-sizing vport replies. The provided information is minimal and does not include technical details, impact specifics, or exploit data. The affected version explicitly stated is version 3.0 of the product. No patch or remediation details are provided, and there is no evidence of exploitation in the wild.

References

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