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Servers and applications

CVE-2013-2076

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.…

Severity
Medium 4.3
Published
28 Aug 2013
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.5% in the next 30 daysHigher than 43% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Information exposure (CWE-200)
Attack
From the same local network · Only under certain conditions · Needs a login
Attacker can
Read data
CVSS vector
AV:A/AC:H/Au:S/C:C/I:N/A:N
Sources
NVD

Description

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.

From NVD.

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • Version 4.2.2
  • Version 4.2.1
  • Version 4.2.0
  • Version 4.1.5
All 14 release lines
  • Version 4.0.0
  • Version 4.0.1
  • Version 4.0.2
  • Version 4.0.3
  • Version 4.0.4
  • Version 4.1.0
  • Version 4.1.1
  • Version 4.1.2
  • Version 4.1.3
  • Version 4.1.4
  • Version 4.1.5
  • Version 4.2.0
  • Version 4.2.1
  • Version 4.2.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2013-2076
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2013-2076