Strix
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CVE-2015-8555

UnknownEPSS 2.25%

Last modified

CVE-2015-8555 is a vulnerability of currently unknown severity. Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.. EPSS estimates a 2.25% chance of exploitation in the next 30 days.

Description

Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.

Metrics

EPSS Probability
2.25%

80.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CitrixXenserver6.0
XenXen4.3.0
XenXen4.3.1
XenXen4.3.2
XenXen4.3.3
XenXen4.3.4
XenXen4.4.0
XenXen4.4.1
XenXen4.4.2
XenXen4.4.3
XenXen4.4.4
XenXen4.5.0
XenXen4.5.1
XenXen4.5.2
XenXen4.5.3
XenXen4.6.0
XenXen4.6.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2015-8555?
Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.
How severe is CVE-2015-8555?
Severity scoring for CVE-2015-8555 is pending analysis. The EPSS model estimates a 2.25% probability of exploitation in the next 30 days.
How do I fix CVE-2015-8555?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-8555?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST