CVE-2019-19767

kernel: use-after-free in __ext4_expand_extra_isize and ext4_xattr_set_entry related to fs/ext4/inode.c and fs/ext4/super.c

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka CID-4ea99936a163.

El kernel de Linux versión anterior a 5.4.2 maneja inapropiadamente la función ext4_expand_extra_isize, como es demostrado por un error de uso de la memoria previamente liberada en las funciones __ext4_expand_extra_isize y ext4_xattr_set_entry, relacionadas con los archivos fs/ext4/inode.c y fs/ext4/super.c, también se conoce como CID-4ea99936a163.

A use-after-free flaw was found in the Linux kernel’s ext4 file system functionality when the user mount ext4 partition, with the usage of an additional debug parameter is defining an extra inode size. If this parameter has a non zero value, this flaw allows a local user to crash the system when inode expansion happens.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

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
2024-08-05 CVE Updated
2024-08-05 First Exploit
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-416: Use After Free

CAPEC

References (15)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2020/01/msg00013.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html	Mailing List
https://security.netapp.com/advisory/ntap-20200103-0001	X_refsource_confirm

URL	Date	SRC
https://bugzilla.kernel.org/show_bug.cgi?id=205609	2024-08-05

URL	Date	SRC
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a	2020-01-03
https://github.com/torvalds/linux/commit/4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a	2020-01-03

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html	2020-01-03
https://bugzilla.kernel.org/show_bug.cgi?id=205707	2020-01-03
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2	2020-01-03
https://usn.ubuntu.com/4258-1	2020-01-03
https://usn.ubuntu.com/4284-1	2020-01-03
https://usn.ubuntu.com/4287-1	2020-01-03
https://usn.ubuntu.com/4287-2	2020-01-03
https://access.redhat.com/security/cve/CVE-2019-19767	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1786160	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"				< 5.4.2 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.2"		-		Affected