CVE-2012-2100

kernel: ext4: fix inconsistency in ext4_fill_flex_info()

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función ext4_fill_flex_info en fs/ext4/super.c en el kernel de Linux anterior a v3.2.2, en la plataforma x86 permite a atacantes remotos asistidos por el usuario activar el sistema de archivos incompatibles con los grupos de datos y posiblemente causar una denegación de servicio a través de un formato incorrecto mediante un sistema de archivos ext4 que contiene un bloque con un tamaño de grupo FLEX_BG de gran tamaño (también conocido como valor de s_log_groups_per_flex). NOTA: esta vulnerabilidad existe debido a un parche incompleto para CVE-2009-4307.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Local

Attack Complexity

High

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2012-04-04 CVE Reserved
2012-05-09 CVE Published
2024-02-01 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-189: Numeric Errors

CAPEC

References (9)

URL	Tag	Source
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b	X_refsource_confirm
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2	X_refsource_confirm
http://www.openwall.com/lists/oss-security/2012/04/12/11	Mailing List
http://www.securityfocus.com/bid/53414	Vdb Entry
https://github.com/torvalds/linux/commit/d50f2ab6f050311dbf7b8f5501b25f0bf64a439b	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2012-1445.html	2023-11-07
http://rhn.redhat.com/errata/RHSA-2012-1580.html	2023-11-07
https://bugzilla.redhat.com/show_bug.cgi?id=809687	2012-12-18
https://access.redhat.com/security/cve/CVE-2012-2100	2012-12-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 3.2.1 Search vendor "Linux" for product "Linux Kernel" and version " <= 3.2.1"		x86		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				3.2 Search vendor "Linux" for product "Linux Kernel" and version "3.2"		x86		Affected