CVE-2012-2100: Linux Kernel

High severity, CVSS 7.1. EPSS: 2.7% chance of exploitation in the next 30 days.

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

Affected products

• Linux Linux Kernel: up to and including 3.2.1; version 3.2 only

Published 2012-07-03. Last modified 2026-06-16.