CVE-2015-5166: n/a vulnerability

CVE-2015-5166: Use-after-free vulnerability in QEMU in Xen 4.5.x and earlier does not completely unplug emulated block dev...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 06:41 UTC (UTC+00:00)

Security readout for executives and security teams

This is a virtualization isolation flaw in Xen’s QEMU device handling. A local user inside an HVM guest could trigger a use-after-free condition when block devices are unplugged, potentially gaining privileges beyond their intended guest boundary. Exposure is most likely on older Xen deployments running HVM guests, especially where guest users or tenants are not fully trusted. Non-Xen platforms, non-HVM guests, or systems already updated through vendor advisories may not be exposed. Prioritize remediation where Xen hosts run untrusted or multi-tenant HVM guests. The business risk is a possible break in virtual machine isolation on legacy infrastructure, though active exploitation is not evidenced in the provided sources. Mitigation focus: Inventory Xen hosts and identify versions 4.5.x and earlier.; Check Xen XSA-139 and OS vendor advisories for fixed packages.; Apply supported Xen/QEMU updates from the platform vendor..

Prepared: Jun 13, 2026, 22:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2015-5166 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 12, 2015, 14:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.