#VU96132 NULL pointer dereference in Linux kernel - CVE-2023-52889

Vulnerability identifier: #VU96132

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-2023-52889

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 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

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External links
https://git.kernel.org/stable/c/ead2ad1d9f045f26fdce3ef1644913b3a6cd38f2
https://git.kernel.org/stable/c/6c920754f62cefc63fccdc38a062c7c3452e2961
https://git.kernel.org/stable/c/46c17ead5b7389e22e7dc9903fd0ba865d05bda2
https://git.kernel.org/stable/c/fce09ea314505a52f2436397608fa0a5d0934fb1

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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.