CVE-2021-28706

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Summary:

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.

Reference Links(if available):

  • https://xenbits.xenproject.org/xsa/advisory-385.txt
  • https://lists.fedoraproject.org/archives/list/[email protected]/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/
  • https://www.debian.org/security/2021/dsa-5017
  • CVSS Score (if available)

    v2: / MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:C

    v3: / HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

    Links to Exploits(if available)

  • Available for Amazon Prime