Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver

Scope

What the vendor says is affected

• cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0
• azl3 kernel 6.6.130.1-3 on Azure Linux 3.0

Timeline

When this advisory changed

1. Apr 11, 2026 at 1:01 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-28810View CVSS, KEV, EPSS, and threat context