PT-2021-8164 · Linux+3 · Linux Kernel+3

Dmitry Vyukov · Published 2021-11-17 · Updated 2025-02-21 · CVE-2021-47186

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to a null pointer dereference in the tipc component of the Linux kernel. Specifically, the function tipc aead init() is vulnerable, and exploitation can lead to a denial of service. The problem arises because kmemdup can return a null pointer, which is not checked, resulting in a null key being dereferenced later in tipc crypto key xmit.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

NULL Pointer Dereference

Weakness Enumeration

CWE-690

CWE-476

Related Identifiers

BDU:2024-09212

CVE-2021-47186

OPENSUSE-SU-2024_2947-1

SUSE-SU-2024:2894-1

SUSE-SU-2024:2939-1

SUSE-SU-2024:2947-1

Affected Products

Astra Linux

Linux Kernel

Red Os

Suse

References · 1223

• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47186 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47186 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-09212 · Security Note
• https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10 · Patch
• https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9 · Patch
• https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2939-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47186 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:2947-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47186 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47186 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47186 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47186 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2894-1 · Vendor Advisory
• https://bugzilla.suse.com/1228565 · Note