Detections
Analytics
CVE-2021-28706
high
Description
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
References
https://xenbits.xenproject.org/xsa/advisory-385.txt
https://www.debian.org/security/2021/dsa-5017