National Cyber-Alert System

Vulnerability Summary for CVE-2006-5173

Overview

Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

Vendor Statments (disclaimer)

Official Statement from Red Hat (11/03/2006)

Not Vulnerable. This flaw only affects kernel versions 2.6.14 to 2.6.18. Red Hat Enterprise Linux 2.1, 3, and 4 does not ship with a vulnerable kernel version.

References to Advisories, Solutions, and Tools

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External Source: CONFIRM

Name: http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826

Type: Patch Information

Hyperlink:http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826

External Source: UBUNTU

Name: USN-395-1

Hyperlink:http://www.ubuntu.com/usn/usn-395-1

External Source: BID

Name: 21851

Hyperlink:http://www.securityfocus.com/bid/21851

External Source: SUSE

Name: SUSE-SA:2006:079

Hyperlink:http://www.novell.com/linux/security/advisories/2006_79_kernel.html

External Source: MANDRIVA

Name: MDKSA-2007:002

Hyperlink:http://www.mandriva.com/security/advisories?name=MDKSA-2007:002

External Source: SECUNIA

Name: 23593

Hyperlink:http://secunia.com/advisories/23593

External Source: SECUNIA

Name: 23384

Hyperlink:http://secunia.com/advisories/23384

External Source: SECUNIA

Name: 23361

Hyperlink:http://secunia.com/advisories/23361

External Source: BUGTRAQ

Name: 20070615 rPSA-2007-0124-1 kernel xen

Hyperlink:http://www.securityfocus.com/archive/1/471457

External Source: SECUNIA

Name: 25691

Hyperlink:http://secunia.com/advisories/25691

External Source: SECUNIA

Name: 23474

Hyperlink:http://secunia.com/advisories/23474