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TITLE:
KVM qemu-kvm "ext4_fill_flex_info()" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA48645

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/48645/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=48645

RELEASE DATE:
2012-04-09

DISCUSS ADVISORY:
http://secunia.com/advisories/48645/#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/48645/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=48645

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 KVM qemu-kvm, 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 within the
"ext4_fill_flex_info()" function in fs/ext4/super.c when mounting a
file system and can be exploited to cause a division by zero.

NOTE: This is caused due to an incomplete fix for vulnerability #2
in:
SA37658

SOLUTION:
Fixed in the GIT repository.

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

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://git.kernel.org/?p=virt/kvm/kvm.git;a=commit;h=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b

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
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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