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TI-2021-09760 Aliases CVE-2021-28694GHSA-7h6m-rq82-825p

IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs…

Priority LOW 30Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

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

Summary

IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).

Why it matters now

EPSS 0.00378 31st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
Xenxen4.11.x—No fix listedCNA
Xenxenxen-unstable—No fix listedCNA
Xenxen4.12.x—No fix listedCNA
Xenxen4.14.x—No fix listedCNA
Xenxen4.15.x—No fix listedCNA
Xenxen4.13.x—No fix listedCNA
  • xen VendorXen Affected 4.11.x Fixed in — No fix listed CNA
  • xen VendorXen Affected xen-unstable Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.12.x Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.14.x Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.15.x Fixed in — No fix listed CNA
  • xen VendorXen Affected 4.13.x Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*all versionsVulnerableXen
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions all versions 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

No fixed version listed by the sources yet.

Fixed in the same release

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

  • Advisory ·

    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 ·

    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 ·

    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 ·

    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

  1. 2026-10-02 Threatist record created from CVE-2021-28694
  2. 2026-10-03 Alias added: GHSA-7h6m-rq82-825p

References

Advisory 9

  • 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