NULL pointer dereference in Linux kernel netfilter

1) NULL pointer dereference

EUVDB-ID: #VU90667

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46283

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the nf_tables_newset() function in net/netfilter/nf_tables_api.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.12 - 5.12.12

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc8:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.3:*:*:*:*:*:*:*

External links

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad9f151e560b016b6ad3280b48e42fa11e1a5440
https://syzkaller.appspot.com/bug?id=22c3987f75a7b90e238a26b5a5920525c2d1f345
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.