Multiple kernel AMD K7/K8 CPUs floating-point unit information disclosure

amd-fpu-information-disclosure (25871) The risk level is classified as LowLow Risk

Description:

Linux and BSD kernels running on systems with AMD K7 or K8 CPUs could allow a local attacker to obtain sensitive information, caused by an error where FOP, FIP and FDP x87 registers are only saved or restored by FXSAVE or FXRSTOR if the exception summary bit is set to 1. This error could result in processes that use floating-point unit (FPU) operations to leak sensitive information, which could be used by an attacker to launch further attacks against the affected system.

Platforms Affected:

  • Canonical, Ubuntu 5.04
  • Canonical, Ubuntu 5.10
  • Canonical, Ubuntu 6.06 LTS
  • Debian, Debian Linux 3.1
  • FreeBSD, FreeBSD
  • Linux, Kernel 2.6.0 test7
  • Linux, Kernel 2.6.0 test8
  • Linux, Kernel 2.6.0 test9
  • Linux, Kernel 2.6.0 test6
  • Linux, Kernel 2.6.0 test5
  • Linux, Kernel 2.6.0
  • Linux, Kernel 2.6.0 test3
  • Linux, Kernel 2.6.0 test2
  • Linux, Kernel 2.6.0 test11
  • Linux, Kernel 2.6.0 test10
  • Linux, Kernel 2.6.0 test1
  • Linux, Kernel 2.6.0 test4
  • Linux, Kernel 2.6.1 rc1
  • Linux, Kernel 2.6.1 rc2
  • Linux, Kernel 2.6.1 rc3
  • Linux, Kernel 2.6.1
  • Linux, Kernel 2.6.10 rc2
  • Linux, Kernel 2.6.10 rc3
  • Linux, Kernel 2.6.10
  • Linux, Kernel 2.6.10 rc1
  • Linux, Kernel 2.6.11 rc2
  • Linux, Kernel 2.6.11 rc3
  • Linux, Kernel 2.6.11 rc4
  • Linux, Kernel 2.6.11
  • Linux, Kernel 2.6.11 rc5
  • Linux, Kernel 2.6.11 rc1
  • Linux, Kernel 2.6.11.1
  • Linux, Kernel 2.6.11.10
  • Linux, Kernel 2.6.11.11
  • Linux, Kernel 2.6.11.12
  • Linux, Kernel 2.6.11.2
  • Linux, Kernel 2.6.11.3
  • Linux, Kernel 2.6.11.4
  • Linux, Kernel 2.6.11.5
  • Linux, Kernel 2.6.11.6
  • Linux, Kernel 2.6.11.7
  • Linux, Kernel 2.6.11.8
  • Linux, Kernel 2.6.11.9
  • Linux, Kernel 2.6.12 rc6
  • Linux, Kernel 2.6.12 rc5
  • Linux, Kernel 2.6.12
  • Linux, Kernel 2.6.12 rc4
  • Linux, Kernel 2.6.12 rc3
  • Linux, Kernel 2.6.12 rc2
  • Linux, Kernel 2.6.12 rc1
  • Linux, Kernel 2.6.12.1
  • Linux, Kernel 2.6.12.12
  • Linux, Kernel 2.6.12.2
  • Linux, Kernel 2.6.12.22
  • Linux, Kernel 2.6.12.3
  • Linux, Kernel 2.6.12.4
  • Linux, Kernel 2.6.12.5
  • Linux, Kernel 2.6.12.6
  • Linux, Kernel 2.6.13 rc6
  • Linux, Kernel 2.6.13 rc7
  • Linux, Kernel 2.6.13 rc5
  • Linux, Kernel 2.6.13
  • Linux, Kernel 2.6.13 rc4
  • Linux, Kernel 2.6.13 rc3
  • Linux, Kernel 2.6.13 rc2
  • Linux, Kernel 2.6.13 rc1
  • Linux, Kernel 2.6.13.1
  • Linux, Kernel 2.6.13.2
  • Linux, Kernel 2.6.13.3
  • Linux, Kernel 2.6.13.4
  • Linux, Kernel 2.6.13.5
  • Linux, Kernel 2.6.14 rc4
  • Linux, Kernel 2.6.14 rc5
  • Linux, Kernel 2.6.14 rc2
  • Linux, Kernel 2.6.14
  • Linux, Kernel 2.6.14 rc1
  • Linux, Kernel 2.6.14 rc3
  • Linux, Kernel 2.6.14.1
  • Linux, Kernel 2.6.14.2
  • Linux, Kernel 2.6.14.3
  • Linux, Kernel 2.6.14.4
  • Linux, Kernel 2.6.14.5
  • Linux, Kernel 2.6.14.6
  • Linux, Kernel 2.6.14.7
  • Linux, Kernel 2.6.15 rc7
  • Linux, Kernel 2.6.15 rc1
  • Linux, Kernel 2.6.15
  • Linux, Kernel 2.6.15 rc2
  • Linux, Kernel 2.6.15 rc6
  • Linux, Kernel 2.6.15 rc3
  • Linux, Kernel 2.6.15 rc4
  • Linux, Kernel 2.6.15 rc5
  • Linux, Kernel 2.6.15.1
  • Linux, Kernel 2.6.15.11
  • Linux, Kernel 2.6.15.2
  • Linux, Kernel 2.6.15.3
  • Linux, Kernel 2.6.15.4
  • Linux, Kernel 2.6.15.5
  • Linux, Kernel 2.6.15.6
  • Linux, Kernel 2.6.15.7
  • Linux, Kernel 2.6.16 rc6
  • Linux, Kernel 2.6.16 rc7
  • Linux, Kernel 2.6.16
  • Linux, Kernel 2.6.16 rc5
  • Linux, Kernel 2.6.16 rc4
  • Linux, Kernel 2.6.16 rc3
  • Linux, Kernel 2.6.16.1
  • Linux, Kernel 2.6.16.2
  • Linux, Kernel 2.6.16.3
  • Linux, Kernel 2.6.16.4
  • Linux, Kernel 2.6.16.5
  • Linux, Kernel 2.6.16.6
  • Linux, Kernel 2.6.16.7
  • Linux, Kernel 2.6.16.8
  • Linux, Kernel 2.6.2 rc1
  • Linux, Kernel 2.6.2
  • Linux, Kernel 2.6.2 rc3
  • Linux, Kernel 2.6.2 rc2
  • Linux, Kernel 2.6.3 rc1
  • Linux, Kernel 2.6.3 rc3
  • Linux, Kernel 2.6.3 rc2
  • Linux, Kernel 2.6.3
  • Linux, Kernel 2.6.3 rc4
  • Linux, Kernel 2.6.4 rc3
  • Linux, Kernel 2.6.4 rc2
  • Linux, Kernel 2.6.4 rc1
  • Linux, Kernel 2.6.4
  • Linux, Kernel 2.6.5 rc3
  • Linux, Kernel 2.6.5 rc2
  • Linux, Kernel 2.6.5
  • Linux, Kernel 2.6.5 rc1
  • Linux, Kernel 2.6.6 rc3
  • Linux, Kernel 2.6.6 rc1
  • Linux, Kernel 2.6.6
  • Linux, Kernel 2.6.6 rc2
  • Linux, Kernel 2.6.7
  • Linux, Kernel 2.6.7 rc1
  • Linux, Kernel 2.6.7 rc2
  • Linux, Kernel 2.6.7 rc3
  • Linux, Kernel 2.6.8 rc3
  • Linux, Kernel 2.6.8 rc2
  • Linux, Kernel 2.6.8 rc4
  • Linux, Kernel 2.6.8 rc1
  • Linux, Kernel 2.6.8
  • Linux, Kernel 2.6.8.1
  • Linux, Kernel 2.6.9
  • Linux, Kernel 2.6.9 rc2
  • Linux, Kernel 2.6.9 rc1
  • Linux, Kernel 2.6.9 rc3
  • Linux, Kernel 2.6.9 rc4
  • Novell, UnitedLinux 1.0
  • RedHat, Enterprise Linux 2.1 WS
  • RedHat, Enterprise Linux 2.1 AS
  • RedHat, Enterprise Linux 2.1 ES
  • RedHat, Enterprise Linux 3 WS
  • RedHat, Enterprise Linux 3 ES
  • RedHat, Enterprise Linux 3 AS
  • RedHat, Enterprise Linux 3 Desktop
  • RedHat, Enterprise Linux 4 AS
  • RedHat, Enterprise Linux 4 ES
  • RedHat, Enterprise Linux 4 WS
  • RedHat, Enterprise Linux 4 Desktop
  • SuSE, Linux Enterprise Server 8
  • SuSE, Linux Enterprise Server 9
  • SuSE, SuSE Linux 10.0
  • SuSE, SuSE Linux 9.1
  • SuSE, SuSE Linux 9.2
  • SuSE, SuSE Linux 9.3
  • SuSE, SuSE Linux Desktop 1.0
  • SuSE, SuSE SLES 9
  • VMware, ESX Server 2.1.3
  • VMware, ESX Server 2.5.3
  • VMware, ESX Server 2.5.4
  • VMware, ESX Server 3.0.0

Remedy:

For Linux kernel:
Upgrade to the latest stable version of Linux kernel (2.6.16.9 or later), available from The Linux Kernel Archives. See References.

For VMware 2.5.3:
Apply the patch for this vulnerability, as listed in the VMware Advisory esx-253-200610-patch. See References.

For FreeBSD:
Refer to FreeBSD Security Advisory FreeBSD-SA-06:14.fpu for patch, upgrade, or suggested workaround information. See References.

For Debian GNU/Linux:
Refer to DSA-1097-1 and DSA-1103-1 for patch, upgrade, or suggested workaround information. See References.

For Red Hat Linux 2.1:
Refer to RHSA-2006:0579-12 for patch, upgrade, or suggested workaround information. See References.

For Red Hat Linux 3:
Refer to RHSA-2006:0437-22 for patch, upgrade, or suggested workaround information. See References.

For Red Hat Linux 4:
Refer to RHSA-2006:0575-22 for patch, upgrade, or suggested workaround information. See References.

For ESX Server 3.0.0:
Apply the patch for this vulnerability, as listed in VMware Advisory Doc ID: 2533126. See References.

For VMware ESX Server 2.1.3:
Apply the patch for this vulnerability, as listed in the VMware Advisory esx-213-200610-patch. See References.

For VMware ESX Server 2.5.4:
Apply the patch for this vulnerability, as listed in the VMware Advisory esx-254-200610-patch. See References.

For SUSE Linux:
Refer to SUSE-SA:2006:028 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

Consequences:

Obtain Information

References:

Reported:

Apr 18, 2006

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email xforce@iss.net

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