CVE-2021-3582 Denial of service in QEMU

What is CVE-2021-3582?

CVE-2021-3582 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 25 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. The issue occurs while handling a "PVRDMA_CMD_CREATE_MR" command due to improper memory remapping (mremap). This flaw allows a malicious guest to crash the QEMU process on the host. The highest threat from this vulnerability is to system availability.

Weakness: CWE-119

Which versions are affected by CVE-2021-3582?

It affects 2 products.

Products include Debian Debian Linux, Qemu Qemu.

How do I fix CVE-2021-3582?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-3582 being exploited?

There is no known exploitation of CVE-2021-3582 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-3582, GHSA-x7v7-hc56-547j, UBUNTU-CVE-2021-3582.