Bug 457718 (CVE-2006-5755)

Summary: CVE-2006-5755 kernel: local denial of service due to NT bit leakage
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dhoward, jpirko, lwang
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2010-12-22 19:18:12 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 457721, 457722    
Bug Blocks:    
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Description Flags
Upstream patch for this issue none

Description Eugene Teo (Security Response) 2008-08-04 07:39:12 UTC 
Description of problem:
Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5755
Comment 1 Eugene Teo (Security Response) 2008-08-04 07:45:34 UTC 
Proposed upstream patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=658fdbef66e5e9be79b457edc2cbbb3add840aa9
Comment 2 Eugene Teo (Security Response) 2008-08-04 07:49:45 UTC 
Created attachment 313340 [details]
Upstream patch for this issue
Comment 8 Vincent Danen 2010-12-22 19:18:12 UTC 
This was addressed via:

Red Hat Enterprise Linux version 5 (RHSA-2008:0957)