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TITLE:
Linux Kernel ext4 Extent Splitting Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA46489

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46489/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46489

RELEASE DATE:
2011-10-25

DISCUSS ADVISORY:
http://secunia.com/advisories/46489/#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/46489/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
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 * Secunia PoC
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https://ca.secunia.com/?page=viewadvisory&vuln_id=46489

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

http://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

An error within the implementation of the ext4 file system when
splitting extents can be exploited to cause a "BUG_ON()".

The vulnerability is reported in version 2.6.39.4. Other versions may
also be affected.

SOLUTION:
Fixed in the GIT repository.

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

PROVIDED AND/OR DISCOVERED BY:
Red Hat credits Zheng Liu.

ORIGINAL ADVISORY:
Red Hat Bug #747642:
https://bugzilla.redhat.com/show_bug.cgi?id=747942

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=667eff35a1f56fa74ce98a0c7c29a40adc1ba4e3

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:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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