High severity8.6NVD Advisory· Published Nov 24, 2021· Updated Jun 17, 2026
CVE-2021-28706
CVE-2021-28706
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
34- osv-coords32 versionspkg:rpm/opensuse/xen&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/xen&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/xen&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/xen&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Micro%205.0pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Micro%205.1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 4.13.4_02-lp152.2.33.1+ 31 more
- (no CPE)range: < 4.13.4_02-lp152.2.33.1
- (no CPE)range: < 4.14.3_04-3.15.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.13.4_02-3.40.1
- (no CPE)range: < 4.14.3_04-3.15.1
- (no CPE)range: < 4.13.4_02-3.40.1
- (no CPE)range: < 4.14.3_04-3.15.1
- (no CPE)range: < 4.13.4_02-3.40.1
- (no CPE)range: < 4.14.3_04-3.15.1
- (no CPE)range: < 4.4.4_50-61.67.1
- (no CPE)range: < 4.7.6_18-43.82.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.12.4_16-3.55.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.12.4_16-3.55.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.55.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.9.4_24-3.97.1
- (no CPE)range: < 4.11.4_24-2.65.1
Patches
Vulnerability mechanics
References
5- xenbits.xenproject.org/xsa/advisory-385.txtnvdMitigationPatchThird Party Advisory
- www.debian.org/security/2021/dsa-5017nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/nvd
- security.gentoo.org/glsa/202402-07nvd
News mentions
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