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CVE-2023-34326

x86/AMD: missing IOMMU TLB flushing

7.8 HighFix available

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.27%Up 0.2 points since Jan 10, 2024
90%50%10%1%

What each source reports

NVD Score used 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-672
Updated
2026-11-02
CVE List 7.8

x86/AMD: missing IOMMU TLB flushing

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-672
Updated
2026-11-02
EUVDEUVD-2023-38407 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
EUVD-2023-38407
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-mjvw-frxx-6hm5 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022)...

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
GHSA-mjvw-frxx-6hm5
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-672
Updated
2026-11-02
OSVALPINE-CVE-2023-34326 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
ALPINE-CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.

Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 11 moreShow less
OSVDEBIAN-CVE-2023-34326 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed. Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
DEBIAN-CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2023-34326 7.8

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed. Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

Record
UBUNTU-CVE-2023-34326
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:13442-1 No score

xen-4.18.0_02-1.1 on GA media

These are all security issues fixed in the xen-4.18.0_02-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:13442-1
Updated
2026-11-02
OSVSUSE-SU-2023:4054-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: A transaction conflict can crash C Xenstored (XSA-440, bsc#1215744)
  • CVE-2023-34326: Missing IOMMU TLB flushing (XSA-442, bsc#1215746)
  • CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443, bsc#1215747)
  • CVE-2023-34327: Debug Mask handling (XSA-444, bsc#1215748)
  • CVE-2023-34328: Debug Mask handling (XSA-444, bsc#1215748)
Record
SUSE-SU-2023:4054-1
Updated
2026-11-02
OSVSUSE-SU-2023:4055-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: A transaction conflict can crash C Xenstored (XSA-440, bsc#1215744)
  • CVE-2023-34326: Missing IOMMU TLB flushing (XSA-442, bsc#1215746)
  • CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443, bsc#1215747)
  • CVE-2023-34327: Debug Mask handling (XSA-444, bsc#1215748)
  • CVE-2023-34328: Debug Mask handling (XSA-444, bsc#1215748)
Record
SUSE-SU-2023:4055-1
Updated
2026-11-02
OSVSUSE-SU-2023:4174-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion (XSA-440) (bsc#1215744).
  • CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems with IOMMU hardware and PCI passthrough enabled (XSA-442) (bsc#1215746).
  • CVE-2023-34325: Fixed multiple parsing issues in libfsimage (XSA-443) (bsc#1215747).
  • CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86 debugging functionality for guests (XSA-444) (bsc#1215748).
Record
SUSE-SU-2023:4174-1
Updated
2026-11-02
OSVSUSE-SU-2023:4183-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion (XSA-440) (bsc#1215744).
  • CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems with IOMMU hardware and PCI passthrough enabled (XSA-442) (bsc#1215746).
  • CVE-2023-34325: Fixed multiple parsing issues in libfsimage (XSA-443) (bsc#1215747).
  • CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86 debugging functionality for guests (XSA-444) (bsc#1215748).
Record
SUSE-SU-2023:4183-1
Updated
2026-11-02
OSVSUSE-SU-2023:4184-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion (XSA-440) (bsc#1215744).
  • CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems with IOMMU hardware and PCI passthrough enabled (XSA-442) (bsc#1215746).
  • CVE-2023-34325: Fixed multiple parsing issues in libfsimage (XSA-443) (bsc#1215747).
  • CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86 debugging functionality for guests (XSA-444) (bsc#1215748).
Record
SUSE-SU-2023:4184-1
Updated
2026-11-02
OSVSUSE-SU-2023:4185-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion (XSA-440) (bsc#1215744).
  • CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems with IOMMU hardware and PCI passthrough enabled (XSA-442) (bsc#1215746).
  • CVE-2023-34325: Fixed multiple parsing issues in libfsimage (XSA-443) (bsc#1215747).
  • CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86 debugging functionality for guests (XSA-444) (bsc#1215748).
Record
SUSE-SU-2023:4185-1
Updated
2026-11-02
OSVSUSE-SU-2023:4475-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-20588: AMD CPU transitional execution leak via division by zero (XSA-439) (bsc#1215474).

  • CVE-2023-34322: top-level shadow reference dropped too early for 64-bit PV guests (XSA-438) (bsc#1215145).

  • CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443) (bsc#1215747).

  • CVE-2023-34326: x86/AMD: missing IOMMU TLB flushing (XSA-442) (bsc#1215746).

  • CVE-2023-34327,CVE-2023-34328: x86/AMD: Debug Mask handling (XSA-444) (bsc#1215748).

  • CVE-2023-46835: x86/AMD: mismatch in IOMMU quarantine page table levels (XSA-445) (bsc#1216654).

  • CVE-2023-46836: x86: BTC/SRSO fixes not fully effective (XSA-446) (bsc#1216807).

  • Upstream bug fixes (bsc#1027519)

Record
SUSE-SU-2023:4475-1
Updated
2026-11-02
OSVSUSE-SU-2023:4476-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2023-20588: AMD CPU transitional execution leak via division by zero (XSA-439) (bsc#1215474).

  • CVE-2023-34322: top-level shadow reference dropped too early for 64-bit PV guests (XSA-438) (bsc#1215145).

  • CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443) (bsc#1215747).

  • CVE-2023-34326: x86/AMD: missing IOMMU TLB flushing (XSA-442) (bsc#1215746).

  • CVE-2023-34327,CVE-2023-34328: x86/AMD: Debug Mask handling (XSA-444) (bsc#1215748).

  • CVE-2023-46835: x86/AMD: mismatch in IOMMU quarantine page table levels (XSA-445) (bsc#1216654).

  • CVE-2023-46836: x86: BTC/SRSO fixes not fully effective (XSA-446) (bsc#1216807).

  • Upstream bug fixes (bsc#1027519)

Record
SUSE-SU-2023:4476-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.15
 before 4.15.5-r3
4.15.5-r3
xen
Alpine:v3.16
 before 4.16.5-r3
4.16.5-r3
xen
Alpine:v3.17
 before 4.16.5-r3
4.16.5-r3
xen
Alpine:v3.18
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.19
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.20
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.21
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.22
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.23
 before 4.17.2-r3
4.17.2-r3
xen
Alpine:v3.24
 before 4.17.2-r3
4.17.2-r3
Show 50 moreShow less
Affected packages
PackageAffectedFixed
xen
Debian:12
 before 4.17.2+76-ge1f9cb16e2-1~deb12u1, plus listed versions
4.17.1+2-gb773c48e36-14.17.2+55-g0b56bed864-14.17.2-1
4.17.2+76-ge1f9cb16e2-1~deb12u1
xen
Debian:13
 before 4.17.2+55-g0b56bed864-1
4.17.2+55-g0b56bed864-1
xen
Debian:14
 before 4.17.2+55-g0b56bed864-1
4.17.2+55-g0b56bed864-1
xen
SUSE:Linux Enterprise Micro 5.5
From an advisory covering 5 CVEs
 before 4.17.2_06-150500.3.12.1
4.17.2_06-150500.3.12.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP5
From an advisory covering 5 CVEs
 before 4.17.2_06-150500.3.12.1
4.17.2_06-150500.3.12.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP5
From an advisory covering 5 CVEs
 before 4.17.2_06-150500.3.12.1
4.17.2_06-150500.3.12.1
xen
openSUSE:Leap 15.5
From an advisory covering 5 CVEs
 before 4.17.2_06-150500.3.12.1
4.17.2_06-150500.3.12.1
xen
SUSE:Linux Enterprise Micro 5.3
From an advisory covering 5 CVEs
 before 4.16.5_06-150400.4.37.1
4.16.5_06-150400.4.37.1
xen
SUSE:Linux Enterprise Micro 5.4
From an advisory covering 5 CVEs
 before 4.16.5_06-150400.4.37.1
4.16.5_06-150400.4.37.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP4
From an advisory covering 5 CVEs
 before 4.16.5_06-150400.4.37.1
4.16.5_06-150400.4.37.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP4
From an advisory covering 5 CVEs
 before 4.16.5_06-150400.4.37.1
4.16.5_06-150400.4.37.1
xen
openSUSE:Leap 15.4
From an advisory covering 5 CVEs
 before 4.16.5_06-150400.4.37.1
4.16.5_06-150400.4.37.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise Server 15 SP3-LTSS
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP3
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Manager Proxy 4.2
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Manager Server 4.2
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise Micro 5.1
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise Micro 5.2
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Enterprise Storage 7.1
From an advisory covering 5 CVEs
 before 4.14.6_06-150300.3.57.1
4.14.6_06-150300.3.57.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS
From an advisory covering 5 CVEs
 before 4.13.5_06-150200.3.80.1
4.13.5_06-150200.3.80.1
xen
SUSE:Linux Enterprise Server 15 SP2-LTSS
From an advisory covering 5 CVEs
 before 4.13.5_06-150200.3.80.1
4.13.5_06-150200.3.80.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP2
From an advisory covering 5 CVEs
 before 4.13.5_06-150200.3.80.1
4.13.5_06-150200.3.80.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 5 CVEs
 before 4.12.4_40-150100.3.95.1
4.12.4_40-150100.3.95.1
xen
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 5 CVEs
 before 4.12.4_40-150100.3.95.1
4.12.4_40-150100.3.95.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 5 CVEs
 before 4.12.4_40-150100.3.95.1
4.12.4_40-150100.3.95.1
xen
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 5 CVEs
 before 4.12.4_40-3.97.1
4.12.4_40-3.97.1
xen
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 5 CVEs
 before 4.12.4_40-3.97.1
4.12.4_40-3.97.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 5 CVEs
 before 4.12.4_40-3.97.1
4.12.4_40-3.97.1
xen
SUSE:Linux Enterprise Micro 5.5
From an advisory covering 8 CVEs
 before 4.17.2_08-150500.3.15.1
4.17.2_08-150500.3.15.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP5
From an advisory covering 8 CVEs
 before 4.17.2_08-150500.3.15.1
4.17.2_08-150500.3.15.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP5
From an advisory covering 8 CVEs
 before 4.17.2_08-150500.3.15.1
4.17.2_08-150500.3.15.1
xen
openSUSE:Leap 15.5
From an advisory covering 8 CVEs
 before 4.17.2_08-150500.3.15.1
4.17.2_08-150500.3.15.1
xen
SUSE:Linux Enterprise Micro 5.3
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
SUSE:Linux Enterprise Micro 5.4
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP4
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP4
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
openSUSE:Leap Micro 5.3
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
openSUSE:Leap Micro 5.4
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
xen
openSUSE:Leap 15.4
From an advisory covering 8 CVEs
 before 4.16.5_08-150400.4.40.1
4.16.5_08-150400.4.40.1
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:Tumbleweed
From an advisory covering 6 CVEs
 before 4.18.0_02-1.1
4.18.0_02-1.1

History

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

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

In short

CVE-2023-34326 is a high vulnerability (CVSS 7.8) in Xen, published October 12, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 20th percentile. Fixed in xen 4.15.5-r3.

References

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