UBUNTU-CVE-2022-33747

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UBUNTU-CVE-2022-33747

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2022-33747, https://xenbits.xen.org/xsa/advisory-409.html, https://xenbits.xenproject.org/xsa/advisory-409.txt, http://xenbits.xen.org/xsa/advisory-409.html, http://www.openwall.com/lists/oss-security/2022/10/11/5, https://www.cve.org/CVERecord?id=CVE-2022-33747