#VU92066 NULL pointer dereference in Linux kernel - CVE-2021-47397

Vulnerability identifier: #VU92066

Vulnerability 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-2021-47397

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

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 sctp_rcv_ootb() function in net/sctp/input.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

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External links
https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d
https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124
https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1
https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997
https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b
https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f

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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.