CVE-2021-28709

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

Last Modified on: 12/01/2021 07:15:00 AM UTC

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

Certain versions of Xen from Xen contain the following vulnerability:

issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)

  • CVE-2021-28709 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Xen - xen version 4.14.x
  • Affected Vendor/Software: URL Logo Xen - xen version 4.12.x
  • Affected Vendor/Software: URL Logo Xen - xen version 4.15.x
  • Affected Vendor/Software: URL Logo Xen - xen version xen-unstable
  • Affected Vendor/Software: URL Logo Xen - xen version 4.13.x

CVSS3 Score: 7.8 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
LOCAL LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH HIGH HIGH

CVSS2 Score: 6.9 - MEDIUM

Access
Vector
Access
Complexity
Authentication
LOCAL MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
COMPLETE COMPLETE COMPLETE

CVE References

Description Tags Link
xenbits.xenproject.org
text/plain
URL Logo MISC xenbits.xenproject.org/xsa/advisory-389.txt
[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

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
XenXen4.15.0AllAllAll
Operating
System
XenXen4.15.1AllAllAll
Operating
System
XenXenAllAllAllAll
Operating
System
XenXenAllAllAllAll
Operating
System
XenXenAllAllAllAll
  • cpe:2.3:o:xen:xen:4.15.0:*:*:*:*:*:x86:*:
  • cpe:2.3:o:xen:xen:4.15.1:*:*:*:*:*:x86:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28709 : issues with partially successful P2M updates on x86 T[his CNA information record relates to multi… twitter.com/i/web/status/1… 2021-11-24 01:08:55
Twitter Icon @oss_security Xen Security Advisory 389 v3 (CVE-2021-28705,CVE-2021-28709) - issues with partially successful P2M updates on x86:… twitter.com/i/web/status/1… 2021-11-24 02:30:11
© CVE.report 2021 Twitter Nitter Twitter Viewer |

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