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TITLE:
Linux Kernel KVM PIT Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA47293

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47293/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47293

RELEASE DATE:
2011-12-22

DISCUSS ADVISORY:
http://secunia.com/advisories/47293/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/47293/

ONLY AVAILABLE IN CUSTOMER AREA:
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 * Report Reliability
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https://ca.secunia.com/?page=viewadvisory&vuln_id=47293

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users in a guest virtual machine to
cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the
"create_pit_timer()" function (arch/x86/kvm/i8254.c) when configuring
a Programmable Interrupt Timer (PIT) and can be exploited to cause a
NULL pointer dereference resulting in the crash of a host.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Jan Kiszka

ORIGINAL ADVISORY:
http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/83564

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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