How severe is CVE-2015-8615?

CVE-2015-8615 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2015-8615 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8615?

CVE-2015-8615 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-8615?

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

When was CVE-2015-8615 published?

CVE-2015-8615 was published on 2016-01-08 and last updated on 2026-06-17.

CVE-2015-8615

CVE-2015-8615 is a medium-severity vulnerability in Xen with a CVSS 3.x base score of 5.0. 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: Medium (CVSS 3.x base score 5.0)
CVSS v2: 2.1
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Xen
Published: 2016-01-08
Last modified: 2026-06-17

Description

The hvm_set_callback_via function in arch/x86/hvm/irq.c in Xen 4.6 does not limit the number of printk console messages when logging the new callback method, which allows local HVM guest OS users to cause a denial of service via a large number of changes to the callback method (HVM_PARAM_CALLBACK_IRQ).

Frequently asked questions

What is CVE-2015-8615?: The hvm_set_callback_via function in arch/x86/hvm/irq.c in Xen 4.6 does not limit the number of printk console messages when logging the new callback method, which allows local HVM guest OS users to cause a denial of service via a large number of changes to the callback method (HVM_PARAM_CALLBACK_IRQ).
How severe is CVE-2015-8615?: CVE-2015-8615 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2015-8615 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8615?: CVE-2015-8615 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-8615?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-8615 published?: CVE-2015-8615 was published on 2016-01-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:*

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