CVE-2016-5242: Null Pointer Dereference
First published: Tue Jun 07 2016(Updated: )
The p2m_teardown function in arch/arm/p2m.c in Xen 4.4.x through 4.6.x allows local guest OS users with access to the driver domain to cause a denial of service (NULL pointer dereference and host OS crash) by creating concurrent domains and holding references to them, related to VMID exhaustion.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen xen-unstable | =4.4.0 | |
| Xen xen-unstable | =4.4.0-rc1 | |
| Xen xen-unstable | =4.4.1 | |
| Xen xen-unstable | =4.4.2 | |
| Xen xen-unstable | =4.4.3 | |
| Xen xen-unstable | =4.4.4 | |
| Xen xen-unstable | =4.5.0 | |
| Xen xen-unstable | =4.5.1 | |
| Xen xen-unstable | =4.5.2 | |
| Xen xen-unstable | =4.5.3 | |
| Xen xen-unstable | =4.6.0 | |
| Xen xen-unstable | =4.6.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2016-5242?
CVE-2016-5242 is considered a high severity vulnerability due to its potential to cause a denial of service by crashing the host OS.
How do I fix CVE-2016-5242?
To address CVE-2016-5242, users should upgrade to a patched version of Xen beyond 4.6.x that resolves the vulnerability.
What type of attack does CVE-2016-5242 facilitate?
CVE-2016-5242 enables local guest OS users to execute a denial of service attack against the host OS by exhausting VMIDs.
Which versions of Xen are affected by CVE-2016-5242?
CVE-2016-5242 affects Xen versions 4.4.x through 4.6.x.
Can CVE-2016-5242 be exploited remotely?
No, CVE-2016-5242 can only be exploited locally by guest OS users with access to the driver domain.
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- vendor/xen
- canonical/xen xen-unstable
- version/xen xen-unstable/4.4.0
- version/xen xen-unstable/4.4.0-rc1
- version/xen xen-unstable/4.4.1
- version/xen xen-unstable/4.4.2
- version/xen xen-unstable/4.4.3
- version/xen xen-unstable/4.4.4
- version/xen xen-unstable/4.5.0
- version/xen xen-unstable/4.5.1
- version/xen xen-unstable/4.5.2
- version/xen xen-unstable/4.5.3
- version/xen xen-unstable/4.6.0
- version/xen xen-unstable/4.6.1