National Cyber-Alert System
Vulnerability Summary for CVE-2009-2849
Original release date:08/18/2009
Last revised:11/06/2009
Source:
US-CERT/NIST
Overview
The md driver (drivers/md/md.c) in the Linux kernel before 2.6.30.2 might allow local users to cause a denial of service (NULL pointer dereference) via vectors related to "suspend_* sysfs attributes" and the (1) suspend_lo_store or (2) suspend_hi_store functions. NOTE: this is only a vulnerability when sysfs is writable by an attacker.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
Official Statement from Red Hat (11/04/2009)
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2849
The flaw was introduced in kernel version 2.6.17-rc1. The Linux kernel as shipped with Red Hat Enterprise Linux 3, and 4 are not affected by this issue.
It was addressed in Red Hat Enterprise MRG via: https://rhn.redhat.com/errata/RHSA-2009-1540.html
A future kernel update for Red Hat Enterprise Linux 5 will address this flaw.
References to Advisories, Solutions, and Tools
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External Source: FEDORA
Name: FEDORA-2009-9044
External Source: REDHAT
Name: RHSA-2009:1540
External Source: MISC
Name: http://xorl.wordpress.com/2009/07/21/linux-kernel-md-driver-null-pointer-dereference/
External Source: XF
Name: kernel-mddriver-dos(52858)
External Source: SECTRACK
Name: 1022961
External Source: MLIST
Name: [oss-security] 20090726 Re: md raid null ptr dereference (when sysfs is writable)
External Source: MLIST
Name: [oss-security] 20090724 md raid null ptr dereference (when sysfs is writable)
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.2
External Source: SECUNIA
Name: 36501
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commit;h=3c92900d9a4afb176d3de335dc0da0198660a244
