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).
Published 2009-12-13 01:30:00
Updated 2025-04-09 00:30:58
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Denial of service

Products affected by CVE-2009-4307

Threat overview for CVE-2009-4307

Top countries where our scanners detected CVE-2009-4307
Top open port discovered on systems with this issue 52869
IPs affected by CVE-2009-4307 240,836
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2009-4307!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2009-4307

3.36%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 86 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2009-4307

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.1
HIGH AV:N/AC:M/Au:N/C:N/I:N/A:C
8.6
6.9
NIST

CWE ids for CVE-2009-4307

  • Assigned by: nvd@nist.gov (Primary)

Vendor statements for CVE-2009-4307

  • Red Hat 2009-12-15
    Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/CVE-2009-4307 The Linux kernel packages as shipped with Red Hat Enterprise Linux 3, 4 and Red Hat Enterprise MRG do not include support for EXT4, and therefore are not affected by this issue. A future kernel update for Red Hat Enterprise Linux 5 will address this flaw.

References for CVE-2009-4307

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