CVE-2022-33747 Denial of service in xen

What is CVE-2022-33747?

CVE-2022-33747 is a low-severity denial of service vulnerability in Debian Debian Linux, published on 11 Oct 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Arm: unbounded memory consumption for 2nd-level page tables Certain actions require e.g. removing pages from a guest's P2M (Physical-to-Machine) mapping. When large pages are in use to map guest pages in the 2nd-stage page tables, such a removal operation may incur a memory allocation (to replace a large mapping with individual smaller ones). These memory allocations are taken from the global memory pool. A malicious guest might be able to cause the global memory pool to be exhausted by manipulating its own P2M mappings.

Weakness: CWE-404

Which versions are affected by CVE-2022-33747?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.

How do I fix CVE-2022-33747?

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-2022-33747 being exploited?

There is no known exploitation of CVE-2022-33747 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 ALPINE-CVE-2022-33747, DEBIAN-CVE-2022-33747, GHSA-wp5g-757j-v342, UBUNTU-CVE-2022-33747.