CVE-2021-28706

Published on: 11/23/2021 12:00:00 AM UTC

Last Modified on: 12/01/2021 02:16:00 PM UTC

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

Certain versions of Fedora from Fedoraproject contain the following vulnerability:

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.

  • CVE-2021-28706 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.

CVSS3 Score: 8.6 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED NONE NONE HIGH

CVSS2 Score: 7.8 - HIGH

Access
Vector
Access
Complexity
Authentication
NETWORK LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE NONE COMPLETE

CVE References

Description Tags Link
[SECURITY] Fedora 35 Update: xen-4.15.1-4.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-03645e9807
xenbits.xenproject.org
text/plain
URL Logo MISC xenbits.xenproject.org/xsa/advisory-385.txt

Related QID Numbers

  • 751411 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3852-1)
  • 751414 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3851-1)
  • 751417 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3842-1)
  • 751422 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3849-1)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
FedoraprojectFedora35AllAllAll
Operating
System
XenXenAllAllAllAll
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28706 : guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB… twitter.com/i/web/status/1… 2021-11-24 00:56:05
Twitter Icon @oss_security Xen Security Advisory 385 v2 (CVE-2021-28706) - guests may exceed their designated memory limit: Posted by Xen . or… twitter.com/i/web/status/1… 2021-11-24 02:30:10
© CVE.report 2021 Twitter Nitter Twitter Viewer |

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