CVE-2021-26933

Published on: 02/16/2021 12:00:00 AM UTC

Last Modified on: 04/11/2021 12:15:00 PM UTC

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

Certain versions of Fedora from Fedoraproject contain the following vulnerability:

An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no guarantee when all the writes will reach the memory.

  • CVE-2021-26933 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.

CVSS3 Score: 5.5 - MEDIUM

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

CVSS2 Score: 2.1 - LOW

Access
Vector
Access
Complexity
Authentication
LOCAL LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL NONE NONE

CVE References

Description Tags Link
[SECURITY] Fedora 33 Update: xen-4.14.1-5.fc33 - package-announce - Fedora Mailing-Lists Mailing List
Third Party Advisory
lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-47f53a940a
Debian -- Security Information -- DSA-4888-1 xen www.debian.org
Depreciated Link
text/html
URL Logo DEBIAN DSA-4888
XSA-364 - Xen Security Advisories Patch
Vendor Advisory
xenbits.xen.org
text/html
URL Logo MISC xenbits.xen.org/xsa/advisory-364.html
[SECURITY] Fedora 32 Update: xen-4.13.2-7.fc32 - package-announce - Fedora Mailing-Lists Mailing List
Third Party Advisory
lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-4c819bf1ad

Related QID Numbers

  • 178530 Debian Security Update for xen (DSA 4888-1)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
FedoraprojectFedora32AllAllAll
Operating
System
FedoraprojectFedora33AllAllAll
Operating
System
FedoraprojectFedora32AllAllAll
Operating
System
FedoraprojectFedora33AllAllAll
Operating
System
XenXenAllAllAllAll
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @LinInfoSec Xen - CVE-2021-26933: xenbits.xen.org/xsa/advisory-3… 2021-04-11 15:27:02
© CVE.report 2022 Twitter Nitter Twitter Viewer |

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