CVE-2013-2076

Publication date 28 August 2013

Last updated 24 July 2024

Ubuntu priority

Xen 4.0.x, 4.1.x, and 4.2.x, when running on AMD64 processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one domain to determine portions of the state of floating point instructions of other domains, which can be leveraged to obtain sensitive information such as cryptographic keys, a similar vulnerability to CVE-2006-1056. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xen	13.04 raring	Fixed 4.2.1-0ubuntu3.2
	12.10 quantal	Fixed 4.1.3-3ubuntu1.6
	12.04 LTS precise	Fixed 4.1.2-2ubuntu2.9
	10.04 LTS lucid	Not in release
xen-3.3	13.04 raring	Not in release
	12.10 quantal	Not in release
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Not affected

Notes

seth-arnold

Only vulnerable if on specific AMD AMD64 CPUs with xsave hypervisor command line option

mdeslaur

This is XSA-52

Patch details

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

Package	Patch details
xen	Upstream: http://lists.xen.org/archives/html/xen-announce/2013-06/binBidYFYTpbK.bin Upstream: http://lists.xen.org/archives/html/xen-announce/2013-06/binRis9tlvy4y.bin