oss-security - Re: CVE request: kernel: NULL pointer dereference in sg_build

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Date: Tue, 22 Sep 2009 03:21:19 -0400 (EDT)
From: "Steven M. Christey" <coley@...us.mitre.org>
To: oss-security@...ts.openwall.com
cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: NULL pointer dereference in
 sg_build_indirect()

======================================================
Name: CVE-2009-3288
Status: Candidate
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3288
Reference: MLIST:[linux-kernel] 20090902 [BUG] 2.6.31-rc8 readcd Oops
Reference: URL:http://lkml.org/lkml/2009/9/3/1
Reference: MLIST:[linux-kernel] 20090903 [PATCH] sg: fix oops in the error path in sg_build_indirect()
Reference: URL:http://lkml.org/lkml/2009/9/3/107
Reference: MLIST:[oss-security] 20090904 CVE request: kernel: NULL pointer dereference in sg_build_indirect()
Reference: URL:http://www.openwall.com/lists/oss-security/2009/09/03/4

The sg_build_indirect function in drivers/scsi/sg.c in Linux kernel
2.6.28-rc1 through 2.6.31-rc8 uses an incorrect variable when
accessing an array, which allows local users to cause a denial of
service (kernel OOPS and NULL pointer dereference), as demonstrated by
using xcdroast to duplicate a CD.  NOTE: this is only exploitable by
users who can open the cdrom device.

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.