CVE-2009-4307

Public Exploit

Description

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service (divide-by-zero error and panic) via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value).

Category

7.1
CVSS
Severity: High
CVSS 2.0 •
EPSS 3.36% Top 15%
Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory mandriva.com Vendor Advisory secunia.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://secunia.com/advisories/38276 third party advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
http://lkml.org/lkml/2009/12/9/255 mailing list
http://www.redhat.com/support/errata/RHSA-2010-0380.html vendor advisory
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log patch
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9874 vdb entry signature
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html vendor advisory
http://bugzilla.kernel.org/show_bug.cgi?id=14287 patch exploit
http://secunia.com/advisories/37658 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html vendor advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2011:029 vendor advisory
http://secunia.com/advisories/38017 third party advisory

Frequently Asked Questions

What is the severity of CVE-2009-4307?
CVE-2009-4307 has been scored as a high severity vulnerability.
How to fix CVE-2009-4307?
To fix CVE-2009-4307, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2009-4307 being actively exploited in the wild?
It is possible that CVE-2009-4307 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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