🟡 Medium | Source: Microsoft Security Response Center
CVE-2026-64133 is a vulnerability in the Linux kernel’s ALSA audio subsystem, specifically the ASI HPI driver, where an out-of-bounds (OOB) array access can occur when reading cached data. While originating in the Linux kernel, this advisory has been published by Microsoft, indicating relevance to Azure environments — likely affecting Linux-based virtual machines or services running on Azure infrastructure. Out-of-bounds memory access flaws can potentially be exploited to read sensitive data or destabilise affected systems.
Security Architect’s Take: Review whether your Azure Linux VM workloads or Azure Kubernetes Service nodes are running kernel versions affected by this CVE, and ensure your patching pipeline applies the relevant Linux kernel update promptly. Given the audio driver context, blast radius in cloud environments is likely limited, but unpatched kernel vulnerabilities can be chained with other exploits.
Original advisory: CVE-2026-64133 ALSA: asihpi: Fix potential OOB array access at reading cache