7.8

CVE-2023-34326: x86/AMD: missing IOMMU TLB flushing

Modified
AliasesALPINE-CVE-2023-34326UBUNTU-CVE-2023-34326DEBIAN-CVE-2023-34326
Published 05-01-2024Last modified 04-11-2025

Vulnerability summary

CVE-2023-34326 is a high (CVSS 7.8) vulnerability in xen. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 9
OPENSUSE-SU-2024:13442-1SUSE-SU-2023:4054-1SUSE-SU-2023:4055-1SUSE-SU-2023:4174-1SUSE-SU-2023:4183-1SUSE-SU-2023:4184-1

Timeline

  1. 05-01-2024
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.29% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • xen< 4.15.5-r3 | < 4.16.5-r3 | < 4.17.2-r3
Debian1 product
  • xen< 4.17.2+76-ge1f9cb16e2-1~deb12u1 | < 4.17.2+55-g0b56bed864-1
Ubuntu1 product
  • xenAll versions (No fix recorded)

3 vendors · 3 products

References

7 links