CVE-2021-28706
HIGHXen 3.2-4.12 - Memory Limit Bypass via 32-bit Overflow
Title source: llmDescription
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 (5)
Core 5
Core References
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/
Third Party Advisory vendor-advisory
https://www.debian.org/security/2021/dsa-5017
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/
Mitigation, Patch, Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-385.txt
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202402-07
Scores
CVSS v3
8.6
EPSS
0.0015
EPSS Percentile
35.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Details
CWE
CWE-770
Status
published
Products (4)
debian/debian_linux
11.0
fedoraproject/fedora
34
fedoraproject/fedora
35
xen/xen
3.2 - 4.12
Published
Nov 24, 2021
Tracked Since
Feb 18, 2026