CVE-2018-1092

kernel: NULL pointer dereference in ext4/mballoc.c:ext4_process_freed_data() when mounting crafted ext4 image

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image.

La función ext4_iget en fs/ext4/inode.c en el kernel de Linux hasta la versión 4.15.15 gestiona de manera incorrecta el caso de un directorio root con un i_lnks_count igual a cero, lo que permite que los atacantes provoquen una denegación de servicio (desreferencia de puntero NULL en ext4_process_freed_data y OOPS) mediante una imagen ext4 manipulada.

The Linux kernel is vulnerable to a NULL pointer dereference in the ext4/mballoc.c:ext4_process_freed_data() function. An attacker could trick a legitimate user or a privileged attacker could exploit this by mounting a crafted ext4 image to cause a kernel panic.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Physical

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

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-12-04 CVE Reserved
2018-04-02 CVE Published
2024-08-05 CVE Updated
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (21)

URL	Tag	Source
http://openwall.com/lists/oss-security/2018/03/29/1	Mailing List
https://bugzilla.kernel.org/show_bug.cgi?id=199179	Issue Tracking
https://bugzilla.kernel.org/show_bug.cgi?id=199275	Issue Tracking
https://lists.debian.org/debian-lts-announce/2018/05/msg00000.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44	2023-02-12

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2018:2948	2023-02-12
https://access.redhat.com/errata/RHSA-2018:3083	2023-02-12
https://access.redhat.com/errata/RHSA-2018:3096	2023-02-12
https://bugzilla.redhat.com/show_bug.cgi?id=1560777	2018-10-30
https://usn.ubuntu.com/3676-1	2023-02-12
https://usn.ubuntu.com/3676-2	2023-02-12
https://usn.ubuntu.com/3677-1	2023-02-12
https://usn.ubuntu.com/3677-2	2023-02-12
https://usn.ubuntu.com/3678-1	2023-02-12
https://usn.ubuntu.com/3678-2	2023-02-12
https://usn.ubuntu.com/3678-3	2023-02-12
https://usn.ubuntu.com/3678-4	2023-02-12
https://usn.ubuntu.com/3754-1	2023-02-12
https://www.debian.org/security/2018/dsa-4187	2023-02-12
https://www.debian.org/security/2018/dsa-4188	2023-02-12
https://access.redhat.com/security/cve/CVE-2018-1092	2018-10-30

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"				<= 4.15.15 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.15.15"		-		Affected