Memory Resource Consumption Issue in Linux Kernel Virtio Transport by a Malicious Guest

CVE-2026-23086

What is CVE-2026-23086?

This vulnerability in the Linux kernel's virtio transport mechanism allows a malicious guest to manipulate TX credit values based on oversized buffer sizes. It can lead to excessive memory allocation on the host, particularly under conditions where many guest connections are established. When a guest advertises a large buffer size, the host's system memory can be driven to its limits, potentially causing performance degradation and responsiveness issues. This flaw necessitates a patch that enforces a bounded TX window, ensuring that the remote peer cannot coerce the host into queuing more data than its own configuration allows. The patch effectively mitigates the risk, limiting the maximum impact on the host's memory management.

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References