#VU90637 NULL pointer dereference in Linux kernel - CVE-2023-52568

Vulnerability identifier: #VU90637

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-2023-52568

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 sgx_encl_eldu(), __sgx_encl_load_page() and sgx_encl_eaug_page() functions in arch/x86/kernel/cpu/sgx/encl.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.1, 6.1 rc1, 6.1 rc3, 6.1 rc7, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.1.5, 6.1.6, 6.1.7, 6.1.8, 6.1.9, 6.1.10, 6.1.11, 6.1.12, 6.1.13, 6.1.14, 6.1.15, 6.1.16, 6.1.17, 6.1.18, 6.1.19, 6.1.20, 6.1.21, 6.1.22, 6.1.23, 6.1.24, 6.1.25, 6.1.26, 6.1.27, 6.1.28, 6.1.29, 6.1.30, 6.1.31, 6.1.32, 6.1.33, 6.1.34, 6.1.35, 6.1.36, 6.1.37, 6.1.38, 6.1.39, 6.1.40, 6.1.41, 6.1.42, 6.1.43, 6.1.44, 6.1.45, 6.1.46, 6.1.47, 6.1.48, 6.1.49, 6.1.50, 6.1.51, 6.1.52, 6.1.53, 6.1.54, 6.1.55, 6.5, 6.5 rc1, 6.5 rc5, 6.5 rc7, 6.5.1, 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.6 rc1, 6.6 rc2, 6.6 rc3, 6.6 rc4, 6.6 rc5, 6.6 rc6

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External links
https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d
https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e
https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.56
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.6
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6

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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.