PT-2021-8133 · Linux+2 · Linux Kernel+2

Syzbot · Published 2021-12-15 · Updated 2025-01-14 · CVE-2021-47106

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description The vulnerability is related to a use-after-free issue in the netfilter component of the Linux kernel. This issue can be exploited to potentially elevate privileges in the system. The vulnerability was reported by syzbot and is associated with the nft set catchall destroy function in net/netfilter/nf tables api.c. The use-after-free occurs when trying to access the @catchall element after it has been freed using kfree rcu(). The vulnerability can be triggered through the netlink release function, which is called when a socket is closed.

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

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2024-08395

CVE-2021-47106

OPENSUSE-SU-2024_3190-1

OPENSUSE-SU-2024_3209-1

OPENSUSE-SU-2024_3483-1

SUSE-SU-2024:3190-1

SUSE-SU-2024:3209-1

SUSE-SU-2024:3483-1

Affected Products

Linux Kernel

Red Os

Suse

References · 660

• 🔥 https://github.com/tr3ee/CVE-2022-23222 · Exploit
• 🔥 https://github.com/tr3ee/CVE-2021-4204 · Exploit
• 🔥 https://github.com/PenteraIO/CVE-2022-23222-POC · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2024:3190-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-08395 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47106 · Vendor Advisory
• https://git.kernel.org/stable/c/9d558e5f0d6fdd0a568f73dceb0b40c4f5012e5a · Patch
• https://git.kernel.org/stable/c/0f7d9b31ce7abdbb29bf018131ac920c9f698518 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47106 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47106 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47106 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47106 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47106 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:3209-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:3483-1 · Vendor Advisory