NULL pointer dereference in Linux kernel

1) NULL pointer dereference

EUVDB-ID: #VU22568

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18680

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 a NULL pointer dereference error within the rds_tcp_kill_sock() function in net/rds/tcp.c in the Linux kernel 4.4.x before 4.4.195. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4.0 - 4.4.194

External links

http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.195
http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=91573ae4aed0a49660abdad4d42f2a0db995ee5e
http://github.com/torvalds/linux/commit/91573ae4aed0a49660abdad4d42f2a0db995ee5e
http://lkml.org/lkml/2019/9/18/337

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.