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CVE-2021-28702

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned...

7.6 HighFix available

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Attack profile

How easy it is to exploit

Attack vector
Physical
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.44%Up 0.1 points since Oct 7, 2021
90%50%10%1%

What each source reports

NVD Score used 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
CVE-2021-28702
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0
4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-269
Updated
2026-11-02
CVE List No score

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
CVE-2021-28702
Updated
2026-11-02
EUVDEUVD-2021-15359 No score

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
EUVD-2021-15359
Updated
2026-11-03
GitHub AdvisoriesGHSA-pcvc-mv96-7jh6 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned...

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
GHSA-pcvc-mv96-7jh6
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
OSVALPINE-CVE-2021-28702 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
ALPINE-CVE-2021-28702
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSV 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
CVE-2021-28702
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
Show 9 moreShow less
OSVDEBIAN-CVE-2021-28702 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
DEBIAN-CVE-2021-28702
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-28702 7.6

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

Record
UBUNTU-CVE-2021-28702
CVSS 3.1
7.6 HighCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2021:1543-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Update to Xen 4.13.4 bug fix release (bsc#1027519).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Record
openSUSE-SU-2021:1543-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:3968-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Update to Xen 4.14.3 bug fix release (bsc#1027519).

Record
openSUSE-SU-2021:3968-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11624-1 No score

xen-4.16.0_01-1.1 on GA media

These are all security issues fixed in the xen-4.16.0_01-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11624-1
Updated
2026-11-02
OSVSUSE-SU-2021:3852-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Fixed 15sp4 uefi fv guest on 12sp5 host unable to bootup with sriov pci device plugin (bsc#1191510).

  • Upstream bug fixes (bsc#1027519).

Record
SUSE-SU-2021:3852-1
Updated
2026-11-02
OSVSUSE-SU-2021:3888-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Update to Xen 4.13.4 bug fix release (bsc#1027519).

Record
SUSE-SU-2021:3888-1
Updated
2026-11-02
OSVSUSE-SU-2021:3968-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Update to Xen 4.14.3 bug fix release (bsc#1027519).

Record
SUSE-SU-2021:3968-1
Updated
2026-11-02
OSVSUSE-SU-2021:3977-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).

  • CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).

  • CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).

  • CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).

  • CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).

  • Upstream bug fixes (bsc#1027519)

Record
SUSE-SU-2021:3977-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.11
 4.13.0 up to 4.13.4-r1
4.13.4-r1
xen
Alpine:v3.12
 4.13.0 up to 4.13.4-r1
4.13.4-r1
xen
Alpine:v3.13
 4.13.0 up to 4.14.3-r1
4.14.3-r1
xen
Alpine:v3.14
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.15
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.16
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.17
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.18
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.19
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.20
 4.13.0 up to 4.15.1-r1
4.15.1-r1
Show 34 moreShow less
Affected packages
PackageAffectedFixed
xen
Alpine:v3.21
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.22
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.23
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Alpine:v3.24
 4.13.0 up to 4.15.1-r1
4.15.1-r1
xen
Debian:12
 before 4.14.3+32-g9de3671772-1
4.14.3+32-g9de3671772-1
xen
Debian:13
 before 4.14.3+32-g9de3671772-1
4.14.3+32-g9de3671772-1
xen
Debian:14
 before 4.14.3+32-g9de3671772-1
4.14.3+32-g9de3671772-1
xen
Debian:11
From an advisory covering 7 CVEs
 before 4.14.3+32-g9de3671772-1~deb11u1, plus listed versions
4.14.2+25-gb6a8c4f72d-24.14.3-14.14.3-1~deb11u1
4.14.3+32-g9de3671772-1~deb11u1
xen
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 7 CVEs
 before 4.12.4_16-3.55.1
4.12.4_16-3.55.1
xen
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 7 CVEs
 before 4.12.4_16-3.55.1
4.12.4_16-3.55.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 7 CVEs
 before 4.12.4_16-3.55.1
4.12.4_16-3.55.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 7 CVEs
 before 4.13.4_02-3.40.1
4.13.4_02-3.40.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP2
From an advisory covering 7 CVEs
 before 4.13.4_02-3.40.1
4.13.4_02-3.40.1
xen
SUSE:Linux Enterprise Micro 5.0
From an advisory covering 7 CVEs
 before 4.13.4_02-3.40.1
4.13.4_02-3.40.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP3
From an advisory covering 7 CVEs
 before 4.14.3_04-3.15.1
4.14.3_04-3.15.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP3
From an advisory covering 7 CVEs
 before 4.14.3_04-3.15.1
4.14.3_04-3.15.1
xen
SUSE:Linux Enterprise Micro 5.1
From an advisory covering 7 CVEs
 before 4.14.3_04-3.15.1
4.14.3_04-3.15.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
SUSE:Linux Enterprise Server 15 SP1-BCL
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
SUSE:Enterprise Storage 6
From an advisory covering 8 CVEs
 before 4.12.4_16-3.57.1
4.12.4_16-3.57.1
xen
Ubuntu:16.04:LTS
 All versions, plus listed versions
4.5.1-0ubuntu14.5.1-0ubuntu24.6.0-1ubuntu14.6.0-1ubuntu24.6.0-1ubuntu4
Show 7 moreShow less
4.6.0-1ubuntu4.14.6.0-1ubuntu4.24.6.0-1ubuntu4.34.6.5-0ubuntu14.6.5-0ubuntu1.14.6.5-0ubuntu1.24.6.5-0ubuntu1.4
 None known
xen
Ubuntu:18.04:LTS
 All versions, plus listed versions
4.9.0-0ubuntu34.9.0-0ubuntu44.9.2-0ubuntu1
 None known
xen
Ubuntu:20.04:LTS
 All versions, plus listed versions
4.9.2-0ubuntu24.9.2-0ubuntu64.9.2-0ubuntu74.11.3+24-g14b62ab3e5-1ubuntu14.11.3+24-g14b62ab3e5-1ubuntu24.11.3+24-g14b62ab3e5-1ubuntu2.24.11.3+24-g14b62ab3e5-1ubuntu2.3
 None known
xen
Ubuntu:22.04:LTS
 All versions, plus listed versions
4.11.4+24-gddaaccbbab-1ubuntu24.16.0-1~ubuntu24.16.0-1~ubuntu2.1
 None known
xen
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.17.2-14.17.2+55-g0b56bed864-14.17.2+76-ge1f9cb16e2-14.17.2+76-ge1f9cb16e2-1ubuntu14.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1.1ubuntu24.17.3+10-g091466ba55-1.1ubuntu3
 None known
xen
Ubuntu:25.10
 All versions, plus listed versions
4.20.0-1ubuntu14.20.0+68-g35cb38b222-1
 None known
xen
Ubuntu:26.10
 All versions, plus listed versions
4.20.2+7-g1badcf5035-2build24.20.2+37-g61ff35323e-1ubuntu14.20.3+127-gc42374a105-1
 None known
xen
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+7-g1badcf5035-24.20.2+7-g1badcf5035-2build2
 None known
xen
openSUSE:Leap 15.2
From an advisory covering 7 CVEs
 before 4.13.4_02-lp152.2.33.1
4.13.4_02-lp152.2.33.1
xen
openSUSE:Leap 15.3
From an advisory covering 7 CVEs
 before 4.14.3_04-3.15.1
4.14.3_04-3.15.1
xen
openSUSE:Tumbleweed
 before 4.16.0_01-1.1
4.16.0_01-1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-28702 is a high vulnerability (CVSS 7.6) in Debian Linux, published October 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in xen 4.13.4-r1.

References

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