Security readout for executives and security teams
CVE-2015-8555 is an information leak in older Xen hypervisors. A user with control of a guest VM could potentially read leftover floating-point or XMM register data from another domain. The main business risk is confidentiality loss between virtual machines on the same host, especially in multi-tenant or untrusted guest environments. Exposure is likely limited to x86 systems running affected Xen versions, especially where guests from different trust zones share hosts. Systems not using Xen, not running affected versions, or not allowing untrusted guest domains are less likely exposed. Treat this as high priority for Xen-based virtualization with untrusted tenants or sensitive workload separation requirements. It is a confidentiality boundary issue inside the hypervisor, but the provided evidence does not show internet-scale remote exploitation. Mitigation focus: Review Xen XSA-165 and applicable vendor advisories for supported fixes.; Update Xen packages through the relevant distribution or virtualization vendor channel.; Prioritize hosts running untrusted or multi-tenant guest workloads..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2015-8555 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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
- GLSA-201604-03CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
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