CVE intelligence and bounded remediation
CVE-2016-9382 — Xen Xen security vulnerability
Xen 4.0.x through 4.7.x mishandle x86 task switches to VM86 mode, which allows local 32-bit x86 HVM guest OS users to gain privileges or cause a denial of service (guest OS crash) by leveraging a guest operating system that uses hardware task switching and allows a new task to start in VM86 mode.
- Severity
- High
- CVSS
- 7.8 (3.0)
- Published
- 2017-01-23
- CISA KEV
- Not currently listed
- Ecosystem
- operating-system
- Weaknesses
- CWE-264
Affected products
- xen / xen / 4.0.0
- xen / xen / 4.0.1
- xen / xen / 4.0.2
- xen / xen / 4.0.3
- xen / xen / 4.0.4
- xen / xen / 4.1.0
Showing 6 representative product identities from 43 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.
Matched remediation archetype
Resource exhaustion and denial of service
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
- Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
- Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.
Remediate safely
- Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
- Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
- Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.
Authoritative sources
Complete CVE record and remediation plan
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