PT-2020-6861 · Linux+5 · Linux Kernel+5

Published 2020-05-01 · Updated 2025-02-21 · CVE-2020-36691

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 5.8

Description The issue is related to uncontrolled recursion in the lib/nlattr.c component of the Linux kernel. This can be exploited by attackers to cause a denial of service via a nested Netlink policy with a back reference. The vulnerability allows attackers to cause a denial of service (unbounded recursion).

Recommendations For Linux kernel versions prior to 5.8, update to version 5.8 or later to resolve the issue. As a temporary workaround, consider restricting access to the lib/nlattr.c component to minimize the risk of exploitation. Avoid using nested Netlink policies with back references in the affected API endpoints until the issue is resolved.

Fix

DoS

Uncontrolled Recursion

Improper Resource Release

Weakness Enumeration

CWE-674

CWE-404

Related Identifiers

ALT-PU-2020-2688

ALT-PU-2020-2716

ALT-PU-2020-2770

ALT-PU-2020-3210

ALT-PU-2021-1083

ALT-PU-2021-1105

ALT-PU-2021-1621

ALT-PU-2021-1656

ALT-PU-2021-1739

ALT-PU-2021-1862

ALT-PU-2021-1866

ALT-PU-2021-1870

BDU:2023-01750

CVE-2020-36691

SUSE-SU-2023:1894-1

SUSE-SU-2023:2146-1

SUSE-SU-2023:2147-1

SUSE-SU-2023:2148-1

SUSE-SU-2023:2151-1

SUSE-SU-2023:2162-1

SUSE-SU-2023:2163-1

SUSE-SU-2023:2232-1

SUSE-SU-2023_2151-1

SUSE-SU-2023_2162-1

SUSE-SU-2023_2163-1

USN-6284-1

USN-6301-1

USN-6312-1

USN-6314-1

USN-6331-1

USN-6337-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Linux Kernel

Suse

Ubuntu

References · 180

• https://github.com/torvalds/linux/commit/7690aa1cdf7c4565ad6b013b324c28b685505e24 · Patch
• https://ubuntu.com/security/CVE-2023-0590 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6331-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-2124 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2023:2148-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-1855 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-27672 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-1611 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20231214SE16 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-3611 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2023:2147-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6331-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6284-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6337-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-30772 · Vendor Advisory