CVE-2009-4307: Linux Kernel

High severity, CVSS 7.1. EPSS: 3.4% chance of exploitation in the next 30 days.

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).

Affected products

• Linux Linux Kernel: up to and including 2.6.32; version 2.6.0 only; version 2.6.1 only; version 2.6.2 only; version 2.6.3 only; version 2.6.4 only; …

Published 2009-12-13. Last modified 2026-06-16.