CVE-2021-28697

CVSS V2 Medium 4.6 CVSS V3 High 7.8
Description
grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.
Overview
  • CVE ID
  • CVE-2021-28697
  • Assigner
  • security@xen.org
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-08-27T19:15:07
  • Last Modified Date
  • 2022-09-28T19:56:45
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* 1 OR 4.0.0 4.15.0
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:L/AC:L/Au:N/C:P/I:P/A:P
  • Access Vector
  • LOCAL
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • PARTIAL
  • Integrity Impact
  • PARTIAL
  • Availability Impact
  • PARTIAL
  • Base Score
  • 4.6
  • Severity
  • MEDIUM
  • Exploitability Score
  • 3.9
  • Impact Score
  • 6.4
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • Attack Vector
  • LOCAL
  • Attack Compatibility
  • LOW
  • Privileges Required
  • LOW
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 7.8
  • Base Severity
  • HIGH
  • Exploitability Score
  • 1.8
  • Impact Score
  • 5.9
History
Created Old Value New Value Data Type Notes
2022-05-10 06:40:50 Added to TrackCVE
2022-12-05 09:12:33 2021-08-27T19:15Z 2021-08-27T19:15:07 CVE Published Date updated
2022-12-05 09:12:33 2022-09-28T19:56:45 CVE Modified Date updated
2022-12-05 09:12:33 Analyzed Vulnerability Status updated
2022-12-05 09:12:38 References updated