PT-2021-5993 · Linux+3 · Linux Kernel+3

Syzbot · Published 2021-06-04 · Updated 2023-05-17 · CVE-2021-46283

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 5.12.13

Description The issue is related to the nf tables newset function in the Linux kernel, which allows local users to cause a denial of service due to a missing initialization for nft set elem expr alloc. This can lead to a NULL pointer dereference and general protection fault. A local user can exploit this by setting a netfilter table expression in their own namespace.

Recommendations For Linux kernel versions prior to 5.12.13, update to version 5.12.13 or later to resolve the issue. At the moment, there is no information about additional mitigation measures for this specific vulnerability.

Fix

DoS

Improper Initialization

Weakness Enumeration

CWE-665

Related Identifiers

ALT-PU-2021-2050

ALT-PU-2021-2199

ALT-PU-2021-2315

ALT-PU-2021-2326

ALT-PU-2021-2330

ALT-PU-2021-3481

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

BDU:2022-00513

CVE-2021-46283

OPENSUSE-SU-2022:0169-1

OPENSUSE-SU-2022:0198-1

OPENSUSE-SU-2022_0169-1

OPENSUSE-SU-2022_0198-1

SUSE-SU-2022:0169-1

SUSE-SU-2022:0198-1

SUSE-SU-2022:0288-1

Affected Products

Alt Linux

Astra Linux

Linux Kernel

Suse

References · 80

• https://ubuntu.com/security/CVE-2021-46283 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-46283 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad9f151e560b016b6ad3280b48e42fa11e1a5440 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2022:0169-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-46283 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2022:0169-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-46283 · Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20220829SE16 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0288-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2022-0819SE17 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-46283 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-46283 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0198-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-00513 · Security Note