PT-2019-4394 · Linux+3 · Linux Kernel+3

Dan Carpenter · Published 2019-03-15 · Updated 2021-05-28 · CVE-2019-19227

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.1

Description The issue is related to a potential NULL pointer dereference in the AppleTalk subsystem of the Linux kernel. This can lead to a denial of service, specifically in the net/appletalk/aarp.c and net/appletalk/ddp.c components. The problem arises because the register snap client function may return NULL, which can cause issues when unregister snap client is called.

Recommendations For Linux kernel versions prior to 5.1, update to version 5.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the AppleTalk subsystem to minimize the risk of exploitation.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2019-1893

ALT-PU-2019-1896

ALT-PU-2019-2120

ALT-PU-2019-2311

ALT-PU-2020-1198

ALT-PU-2020-1501

ALT-PU-2020-2410

ALT-PU-2020-2433

ALT-PU-2021-1870

BDU:2020-00116

CVE-2019-19227

DLA-2068-1

DLA-2114-1

OPENSUSE-SU-2019:2675-1

OPENSUSE-SU-2019_2675-1

SUSE-SU-2019:3200-1

SUSE-SU-2019:3289-1

SUSE-SU-2019:3316-1

SUSE-SU-2019:3317-1

SUSE-SU-2019:3371-1

SUSE-SU-2019:3372-1

SUSE-SU-2019:3381-1

SUSE-SU-2020:0093-1

SUSE-SU-2020:0599-1

SUSE-SU-2020:0613-1

SUSE-SU-2020:14354-1

USN-4254-1

USN-4254-2

USN-4258-1

USN-4287-1

USN-4287-2

Affected Products

Alt Linux

Linux Kernel

Suse

Ubuntu

References · 680

• https://osv.dev/vulnerability/CVE-2019-19227 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-19252 · Vendor Advisory
• https://usn.ubuntu.com/4287-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:3371-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:2675-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-19063 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html · Vendor Advisory
• https://osv.dev/vulnerability/USN-4254-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4254-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-18683 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-14615 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-7053 · Vendor Advisory
• https://usn.ubuntu.com/4258-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4254-2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-19227 · Security Note