CVE-2012-0218

Publication date 12 June 2012

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Description

Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service (guest crash) by later triggering an exception that would normally be handled within Xen. It has been discovered that the code in Xen which does this fails to clear a flag requesting exception injection, with the result that a future exception taken by the guest and handled entirely inside Xen will also be injected into the guest despite Xen having handled it already, probably crashing the guest.

Read the notes from the security team

Status

Package Ubuntu Release Status
xen 13.10 saucy
Not affected
13.04 raring
Not affected
12.10 quantal
Not affected
12.04 LTS precise
Fixed 4.1.2-2ubuntu2.1
11.10 oneiric
Fixed 4.1.1-2ubuntu4.2
11.04 natty Not in release
10.04 LTS lucid Not in release
8.04 LTS hardy Not in release
xen-3.1 13.10 saucy Not in release
13.04 raring Not in release
12.10 quantal Not in release
12.04 LTS precise Not in release
11.10 oneiric Not in release
11.04 natty Not in release
10.04 LTS lucid Not in release
8.04 LTS hardy Ignored end of life
xen-3.2 13.10 saucy Not in release
13.04 raring Not in release
12.10 quantal Not in release
12.04 LTS precise Not in release
11.10 oneiric Not in release
11.04 natty Not in release
10.04 LTS lucid Not in release
8.04 LTS hardy
Fixed 3.2.0-0ubuntu10.2
xen-3.3 13.10 saucy Not in release
13.04 raring Not in release
12.10 quantal Not in release
12.04 LTS precise Not in release
11.10 oneiric Not in release
11.04 natty Ignored end of life
10.04 LTS lucid Ignored end of life
8.04 LTS hardy Not in release

Notes

tyhicks

HVM (fully-virtualised) is not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
xen

References

Other references

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