arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.31.4 on the x86_64 platform does not clear certain kernel registers before a return to user mode, which allows local users to read register values from an earlier process by switching an ia32 process to 64-bit mode.
Novell Linux Desktop 9 for x86 Novell Linux Desktop 9 for x86_64 Open Enterprise Server openSUSE 11.0 openSUSE 11.1 SUSE CORE 9 for AMD64 and Intel EM64T SUSE Linux Enterprise 11 GA for EC2 SUSE Linux Enterprise Desktop 10 SP3 for AMD64 and Intel EM64T SUSE Linux Enterprise Desktop 10 SP3 for x86 SUSE Linux Enterprise Desktop 11 GA SUSE Linux Enterprise Desktop 12 SP4 SUSE Linux Enterprise Desktop 15 SUSE Linux Enterprise Desktop 15 SP1 SUSE Linux Enterprise Desktop 15 SP2 SUSE Linux Enterprise High Availability Extension 11 SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise High Performance Computing 15 SUSE Linux Enterprise High Performance Computing 15 SP1 SUSE Linux Enterprise High Performance Computing 15 SP2 SUSE Linux Enterprise Micro 5.0 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Module for Basesystem 15 SUSE Linux Enterprise Module for Basesystem 15 SP1 SUSE Linux Enterprise Module for Basesystem 15 SP2 SUSE Linux Enterprise Module for Development Tools 15 SUSE Linux Enterprise Module for Development Tools 15 SP1 SUSE Linux Enterprise Module for Development Tools 15 SP2 SUSE Linux Enterprise SDK 10 SP2 SUSE Linux Enterprise SDK 10 SP3 SUSE Linux Enterprise SDK 11 GA SUSE Linux Enterprise Server 10 SP3 SUSE Linux Enterprise Server 11 SUSE Linux Enterprise Server 11 GA SUSE Linux Enterprise Server 12 SP4 SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server 15 SUSE Linux Enterprise Server 15 SP1 SUSE Linux Enterprise Server 15 SP2 SUSE Linux Enterprise Server for SAP Applications 11 SUSE Linux Enterprise Server for SAP Applications 12 SP2 SUSE Linux Enterprise Server for SAP Applications 12 SP3 SUSE Linux Enterprise Server for SAP Applications 12 SP4 SUSE Linux Enterprise Server for SAP Applications 12 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SUSE Linux Enterprise Server for SAP Applications 15 SP1 SUSE Linux Enterprise Server for SAP Applications 15 SP2 SUSE Linux Enterprise Storage 6 SUSE Linux Enterprise Storage 7 SUSE Manager Proxy 4.0 SUSE Manager Proxy 4.1 SUSE Manager Retail Branch Server 4.0 SUSE Manager Retail Branch Server 4.1 SUSE Manager Server 4.0 SUSE Manager Server 4.1