TI-2021-09765 Aliases CVE-2021-28699 GHSA-gp69-2mv4-2f25

inadequate grant-v2 status frames array bounds check The v2 grant table interface…

LOW 25Published 2021-08-27 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can be accessed through. For 32-bit guests on x86, translation of requests has to occur because the interface structure layouts commonly differ between 32- and 64-bit. The translation of the request to obtain the frame numbers of the grant status table involves translating the resulting array of frame numbers. Since the space used to carry out the translation is limited, the translation layer tells the core function the capacity of the array within translation space. Unfortunately the core function then only enforces array bounds to be below 8 times the specified value, and would write past the available space if enough frame numbers needed storing.

Why it matters now

EPSS 0.00353 29th percentileScored 2026-11-07

Fix Fixed xen (Xen): next of xen-unstable

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Xen	xen	4.11.x and later	next of xen-unstable	Patch available	CNA

xen VendorXen Affected 4.11.x and later Fixed in next of xen-unstable Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:xen:xen::::::::	4.10.0	Vulnerable	Xen
cpe:2.3:o:fedoraproject:fedora:33:::::::*	33	Vulnerable	Fedoraproject
cpe:2.3:o:fedoraproject:fedora:34:::::::*	34	Vulnerable	Fedoraproject
cpe:2.3:o:fedoraproject:fedora:35:::::::*	35	Vulnerable	Fedoraproject
cpe:2.3:o:debian:debian_linux:11.0:::::::*	11.0	Vulnerable	Debian

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions 4.10.0 Vulnerable ·Xen
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

Fix · CNA xen (Xen) Fixed in next of xen-unstable

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2021-08-27
xen — FEDORA-2021-081f9bf5d2
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2021-09763 Race condition in xenPriority LOW 34
- TI-2021-09762 Incorrect authorization in xenPriority LOW 30
- TI-2021-09761 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs…Priority LOW 30
Show all 7 records → Advisory →
Advisory · 2021-08-27
xen — FEDORA-2021-d68ed12e46
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2021-09763 Race condition in xenPriority LOW 34
- TI-2021-09762 Incorrect authorization in xenPriority LOW 30
- TI-2021-09761 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs…Priority LOW 30
Show all 7 records → Advisory →

Show 2 more groups

Advisory · 2021-08-27
xen — FEDORA-2021-4f129cc0c1
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2021-09763 Race condition in xenPriority LOW 34
- TI-2021-09762 Incorrect authorization in xenPriority LOW 30
- TI-2021-09761 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs…Priority LOW 30
Show all 7 records → Advisory →
Advisory · 2021-08-27
xen — DSA-4977
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2021-09763 Race condition in xenPriority LOW 34
- TI-2021-09762 Incorrect authorization in xenPriority LOW 30
- TI-2021-09761 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs…Priority LOW 30
Show all 7 records → Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2021-28699
2026-10-03 Alias added: GHSA-gp69-2mv4-2f25

References

Advisory 6

TI-2012-00210 The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix… CVSS 2.0HIGH 7.2
TI-2023-07042 Information disclosure through error messages in AMD Ryzen™ 3000 Series Desktop… CVSS 3.1MEDIUM 5.5
TI-2015-04333 The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used… CVSS 2.0HIGH 9.3
TI-2015-06741 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows… CVSS 3.1CRITICAL 10.0
TI-2018-06436 A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures… CVSS 3.0HIGH 7.8
TI-2024-20522 x86: Incorrect logic for BTC/SRSO mitigations CVSS 3.1HIGH 7.5

See all 489 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences