NULL pointer dereference in Linux kernel apparmor

1) NULL pointer dereference

EUVDB-ID: #VU96132

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/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-2023-52889

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 apparmor_socket_sock_rcv_skb() function in security/apparmor/lsm.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

External links

http://git.kernel.org/stable/c/ead2ad1d9f045f26fdce3ef1644913b3a6cd38f2
http://git.kernel.org/stable/c/6c920754f62cefc63fccdc38a062c7c3452e2961
http://git.kernel.org/stable/c/46c17ead5b7389e22e7dc9903fd0ba865d05bda2
http://git.kernel.org/stable/c/fce09ea314505a52f2436397608fa0a5d0934fb1

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.