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Fencer Vulns
high 7.8

CVE-2023-34326 json

x86/AMD: missing IOMMU TLB flushing

published 2024-01-05 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-38407

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 12 4.17.2+76-ge1f9cb16e2-1~deb12u1
  • xen Debian 14, Debian 13 4.17.2+55-g0b56bed864-1

debian advisories DEBIAN-CVE-2023-34326

  • xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.4 +4 more 4.16.5_08-150400.4.40.1
  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 4.17.2_08-150500.3.15.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_40-3.97.1
  • xen SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +6 more 4.14.6_06-150300.3.57.1
  • xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.4 +2 more 4.16.5_06-150400.4.37.1
  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 4.17.2_06-150500.3.12.1
  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 4.12.4_40-150100.3.95.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS 4.13.5_06-150200.3.80.1

suse advisories SUSE-SU-2023:4476-1SUSE-SU-2023:4475-1SUSE-SU-2023:4185-1SUSE-SU-2023:4184-1SUSE-SU-2023:4183-1SUSE-SU-2023:4174-1

  • xen openSUSE Tumbleweed 4.18.0_02-1.1

opensuse advisories openSUSE-SU-2024:13442-1

  • xen Alpine 3.15 4.15.5-r3
  • xen Alpine 3.17, Alpine 3.16 4.16.5-r3
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 4.17.2-r3

alpine advisories ALPINE-CVE-2023-34326

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Xen Xen

Classification

Weakness
  • CWE-672 Operation on a Resource after Expiration or Release

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.