How severe is CVE-2015-8338?

CVE-2015-8338 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2015-8338 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8338?

CVE-2015-8338 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-8338?

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.

When was CVE-2015-8338 published?

CVE-2015-8338 was published on 2015-12-17 and last updated on 2026-06-17.

CVE-2015-8338

CVE-2015-8338 is a high-severity vulnerability in Xen with a CVSS 2.0 base score of 7.2. 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-254.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Xen
Published: 2015-12-17
Last modified: 2026-06-17

Description

Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM_increase_reservation, (2) XENMEM_populate_physmap, (3) XENMEM_exchange, and possibly other HYPERVISOR_memory_op suboperations, which allows ARM guest OS administrators to cause a denial of service (CPU consumption, guest reboot, or watchdog timeout and host reboot) and possibly have unspecified other impact via unknown vectors.

Frequently asked questions

What is CVE-2015-8338?: Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM_increase_reservation, (2) XENMEM_populate_physmap, (3) XENMEM_exchange, and possibly other HYPERVISOR_memory_op suboperations, which allows ARM guest OS administrators to cause a denial of service (CPU consumption, guest reboot, or watchdog timeout and host reboot) and possibly have unspecified other impact via unknown vectors.
How severe is CVE-2015-8338?: CVE-2015-8338 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-2015-8338 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8338?: CVE-2015-8338 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-8338?: 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.
When was CVE-2015-8338 published?: CVE-2015-8338 was published on 2015-12-17 and last updated on 2026-06-17.

References

Affected products (1)

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

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