CVE-2009-4307
CVE-2009-4307 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.
Key facts
- Severity: High (CVSS 2.0 base score 7.1)
- EPSS exploit prediction: 3% (88th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-189
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
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).
Frequently asked questions
- What is CVE-2009-4307?
- 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).
- How severe is CVE-2009-4307?
- CVE-2009-4307 has a CVSS 2.0 base score of 7.1, rated high severity.
- Is CVE-2009-4307 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2009-4307?
- CVE-2009-4307 primarily affects Linux Linux Kernel. In total, 332 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2009-4307?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2009-4307 published?
- CVE-2009-4307 was published on 2009-12-13 and last updated on 2026-06-16.
References
- http://bugzilla.kernel.org/show_bug.cgi?id=14287
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html
- http://lkml.org/lkml/2009/12/9/255
- http://secunia.com/advisories/37658
- http://secunia.com/advisories/38017
- http://secunia.com/advisories/38276
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
- http://www.redhat.com/support/errata/RHSA-2010-0380.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9874
Affected products (332)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.2:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.3:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.4:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.5:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.6:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.7:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.8:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.8.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.9:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.10:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.2:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.3:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.4:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.5:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.6:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.7:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.8:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.9:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.10:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.11:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.11.12:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.2:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.3:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.4:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.5:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12.6:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13.1:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13.2:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13.3:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13.4:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.13.5:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.14:*:*:*:*:*:*:*
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