CVE-2019-19770

kernel: use-after-free in debugfs_remove in fs/debugfs/inode.c

Severity Score

8.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux kernel developers dispute this issue as not being an issue with debugfs, instead this is an issue with misuse of debugfs within blktrace

** EN DISPUTA ** En el kernel de Linux versión 4.19.83, presenta un uso de la memoria previamente liberada en la función debugfs_remove en el archivo fs/debugfs/inode.c (que se usa para eliminar un archivo o directorio en debugfs que se creó previamente con una llamada a otra función debugfs como debugfs_create_file). NOTA: Los desarrolladores del kernel de Linux disputan este problema como no un problema con debugfs, sino que es un problema con el mal uso de debugfs dentro de blktrace.

A use-after-free flaw was found in the debugfs_remove function in the Linux kernel. The flaw could allow a local attacker with special user (or root) privilege to crash the system at the time of file or directory removal. This vulnerability can lead to a kernel information leak. The highest threat from this vulnerability is to system availability.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-12 CVE Reserved
2019-12-12 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-416: Use After Free

CAPEC

References (7)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html	Mailing List
https://lore.kernel.org/linux-block/20200402000002.7442-1-mcgrof%40kernel.org	X_refsource_misc
https://security.netapp.com/advisory/ntap-20200103-0001	Third Party Advisory

URL	Date	SRC
https://bugzilla.kernel.org/show_bug.cgi?id=205713	2024-08-05

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html	2024-05-17
https://access.redhat.com/security/cve/CVE-2019-19770	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1786179	2020-11-04

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"				<= 4.19.83 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.19.83"		-		Affected