How severe is CVE-2023-34326?

CVE-2023-34326 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-34326 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34326?

CVE-2023-34326 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34326?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-34326 have an EU (EUVD) identifier?

Yes. CVE-2023-34326 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38407.

When was CVE-2023-34326 published?

CVE-2023-34326 was published on 2024-01-05 and last updated on 2026-06-17.

CVE-2023-34326

CVE-2023-34326 is a high-severity vulnerability in Xen with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-672.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-38407
Weakness: CWE-672
Affected product: Xen
Published: 2024-01-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-34326?: 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.
How severe is CVE-2023-34326?: CVE-2023-34326 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-34326 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34326?: CVE-2023-34326 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34326?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-34326 have an EU (EUVD) identifier?: Yes. CVE-2023-34326 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38407.
When was CVE-2023-34326 published?: CVE-2023-34326 was published on 2024-01-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*

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