CVE-2017-7495

kernel: ext4: power failure during write(2) causes on-disk information leak

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

fs/ext4/inode.c in the Linux kernel before 4.6.2, when ext4 data=ordered mode is used, mishandles a needs-flushing-before-commit list, which allows local users to obtain sensitive information from other users' files in opportunistic circumstances by waiting for a hardware reset, creating a new file, making write system calls, and reading this file.

En el archivo fs/ext4/inode.c en el kernel de Linux anterior a versión 4.6.2, cuando es usado el modo data=ordered de ext4, maneja inapropiadamente una lista de necesidades de descarga antes de confirmar, lo que permite a los usuarios locales obtener información confidencial de los archivos de otros usuarios en circunstancias oportunistas al esperar un reinicio del hardware, crear un archivo nuevo, hacer llamadas al sistema de escritura y leer este archivo.

A vulnerability was found in the Linux kernel where filesystems mounted with data=ordered mode may allow an attacker to read stale data from recently allocated blocks in new files after a system 'reset' by abusing ext4 mechanics of delayed allocation.

USN-3405-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that a use-after-free vulnerability existed in the POSIX message queue implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-04-05 CVE Reserved
2017-05-15 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-665: Improper Initialization

CAPEC

References (8)

URL	Tag	Source
http://www.securityfocus.com/bid/98491	Vdb Entry
https://source.android.com/security/bulletin/2017-09-01	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824	2023-02-12
http://www.openwall.com/lists/oss-security/2017/05/15/2	2023-02-12
https://bugzilla.redhat.com/show_bug.cgi?id=1450261	2017-09-06
https://github.com/torvalds/linux/commit/06bd3c36a733ac27962fea7d6f47168841376824	2023-02-12

URL	Date	SRC
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.2	2023-02-12
https://access.redhat.com/security/cve/CVE-2017-7495	2017-09-06

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"				<= 4.6.1 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.6.1"		-		Affected