CVE-2012-2100

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

2.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2012-07-03 16:40 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:40 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.7% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2012-07-03 16:40 UTC

Last modified

2026-06-16 23:40 UTC

Exploit probability

2.7% · EPSS, next 30 days

Weakness

CWE-189

Record status

Modified

Affected

• Linux Kernel ≤ 3.2.1
• Linux Kernel 3.2

Attack profile CVSS 2.0 · 7.1

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2012-2100.md and follow it. Check whether this project is affected by CVE-2012-2100. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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