NULL pointer dereference in Linux kernel ipv4

1) NULL pointer dereference

EUVDB-ID: #VU90402

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47572

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 nh_create_ipv6() function in net/ipv4/nexthop.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503
http://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225
http://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0
http://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99

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.