CVE intelligence and bounded remediation

CVE-2016-9386 — Citrix Xenserver security vulnerability

High CVSS 7.8

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Severity
High
CVSS
7.8 (3.0)
Published
2017-01-23
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-264

Affected products

  • citrix / xenserver / 6.0.2
  • citrix / xenserver / 6.2.0
  • citrix / xenserver / 6.5
  • citrix / xenserver / 7.0
  • xen / xen

Matched remediation archetype

General vulnerability remediation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Confirm the affected component, deployment paths, reachable interfaces, and enabled features from inventories and configuration, without probing production destructively.
  • Compare the advisory's affected conditions with the repository lockfiles, build manifests, artifacts, and runtime inventory.
  • Identify data sensitivity, trust boundaries, and privilege level for every confirmed affected deployment.

Remediate safely

  • Apply a vendor-supported fix or remove the affected component or feature; record the selected change and its source in the repository.
  • Update direct and transitive dependency locks, generated artifacts, deployment manifests, and asset inventories together.
  • Add a regression test for the documented unsafe condition using inert inputs and preserve rollback instructions.

Authoritative sources

Complete CVE record and remediation plan

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