UBUNTU-CVE-2023-46837

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UBUNTU-CVE-2023-46837

Summary:

Details: Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory. This undefined behavior was meant to be addressed by XSA-437, but the approach was not sufficient.

References: https://ubuntu.com/security/CVE-2023-46837, https://xenbits.xen.org/xsa/advisory-447.html, https://www.cve.org/CVERecord?id=CVE-2023-46837