PT-2021-6804 · Xen+1 · Xen+1

Jan Beulich · Published 2021-08-27 · Updated 2022-09-28 · CVE-2021-28697

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Xen (affected versions not specified)

Description The issue is related to the management of grant table v2 status pages in Xen. When a guest switches from v2 to v1, these pages get de-allocated, but the hypervisor may not correctly track their mapping within the guest space. This can lead to a situation where a guest retains access to a page that was freed and potentially re-used for other purposes, allowing an attacker to access confidential data, disrupt its integrity, or cause a denial of service.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Improper Privilege Management

Weakness Enumeration

CWE-362

CWE-269

Related Identifiers

BDU:2022-02227

CVE-2021-28697

DSA-4977-1

OPENSUSE-SU-2021:1236-1

OPENSUSE-SU-2021:2923-1

OPENSUSE-SU-2021_1236-1

OPENSUSE-SU-2021_2923-1

SUSE-SU-2021:14848-1

SUSE-SU-2021:2922-1

SUSE-SU-2021:2923-1

SUSE-SU-2021:2924-1

SUSE-SU-2021:2925-1

SUSE-SU-2021:2943-1

SUSE-SU-2021:2955-1

SUSE-SU-2021:2957-1

SUSE-SU-2021:3322-1

SUSE-SU-2021_14848-1

Affected Products

Suse

Xen

References · 107

• https://osv.dev/vulnerability/SUSE-SU-2021:2957-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4977-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-28697 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28697 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-28697 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:2922-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:1236-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:2943-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-28697 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:2924-1 · Vendor Advisory
• https://debian.org/security/2021/dsa-4977 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2021-28697 · Vendor Advisory