How severe is CVE-2015-5166?

CVE-2015-5166 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2015-5166 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-2015-5166?

CVE-2015-5166 primarily affects Fedoraproject Fedora. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-5166?

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-2015-5166 published?

CVE-2015-5166 was published on 2015-08-12 and last updated on 2026-06-17.

CVE-2015-5166

CVE-2015-5166 is a high-severity vulnerability in Fedoraproject Fedora 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-264.

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-264
Affected product: Fedoraproject Fedora
Published: 2015-08-12
Last modified: 2026-06-17

Description

Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice.

Frequently asked questions

What is CVE-2015-5166?: Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block devices, which allows local HVM guest users to gain privileges by unplugging a block device twice.
How severe is CVE-2015-5166?: CVE-2015-5166 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-2015-5166 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-2015-5166?: CVE-2015-5166 primarily affects Fedoraproject Fedora. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-5166?: 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-2015-5166 published?: CVE-2015-5166 was published on 2015-08-12 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:*

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