PT-2021-8214 · Linux+3 · Linux Kernel+3

Syzbot · Published 2021-12-14 · Updated 2024-12-04 · CVE-2021-47591

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 (affected versions not specified)

Description The issue is related to the mptcp component of the Linux kernel, where a null pointer dereference can occur in the mptcp supported sockopt() function. This can lead to a denial of service. The problem arises because TCP ULP setsockopt cannot be used for mptcp due to its internal use for plumbing subflow sockets to the mptcp layer. A crash was triggered by syzbot for mptcp connections in fallback mode, resulting in a null pointer dereference.

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-476

Related Identifiers

BDU:2024-11527

CVE-2021-47591

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 · 1215

• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://git.kernel.org/stable/c/404cd9a22150f24acf23a8df2ad0c094ba379f57 · Patch
• https://ubuntu.com/security/CVE-2021-47591 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2939-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2947-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47591 · Vendor Advisory
• https://git.kernel.org/stable/c/3de0c86d42f841d1d64f316cd949e65c566f0734 · Patch
• https://bdu.fstec.ru/vul/2024-11527 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47591 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47591 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47591 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47591 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2894-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47591 · Vendor Advisory
• https://bugzilla.suse.com/1228565 · Note