How severe is CVE-2023-34321?

CVE-2023-34321 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-34321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34321?

CVE-2023-34321 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-34321 have an EU (EUVD) identifier?

Yes. CVE-2023-34321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38402.

When was CVE-2023-34321 published?

CVE-2023-34321 was published on 2024-01-05 and last updated on 2026-06-17.

CVE-2023-34321

CVE-2023-34321 is a low-severity vulnerability in Xen with a CVSS 3.x base score of 3.3. 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-119.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-38402
Weakness: CWE-119
Affected product: Xen
Published: 2024-01-05
Last modified: 2026-06-17

Description

Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory.

Frequently asked questions

What is CVE-2023-34321?: Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest. Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory.
How severe is CVE-2023-34321?: CVE-2023-34321 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-34321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34321?: CVE-2023-34321 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-34321 have an EU (EUVD) identifier?: Yes. CVE-2023-34321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-38402.
When was CVE-2023-34321 published?: CVE-2023-34321 was published on 2024-01-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*

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