The MITRE CVE dictionary describes this issue as:
Linux kernel before 184.108.40.206 does not properly handle uncanonical return addresses on Intel EM64T CPUs, which reports an exception in the SYSRET instead of the next instruction, which causes the kernel exception handler to run on the user stack with the wrong GS.
Red Hat security errata
|Red Hat Enterprise Linux version 3 (kernel)||RHSA-2006:0437||July 20, 2006|
|Red Hat Enterprise Linux version 4 (kernel)||RHSA-2006:0493||May 24, 2006|
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