#VU81658 Integer overflow in Linux kernel - CVE-2023-38427

Vulnerability identifier: #VU81658

Vulnerability risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-38427

CWE-ID: CWE-190

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow within the deassemble_neg_contexts() function in fs/smb/server/smb2pdu.c in ksmbd. A remote attacker can send specially crafted data to ksmbd, trigger an integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 6.3.8, 6.3.8

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server?id=f1a411873c85b642f13b01f21b534c2bab81fc1b
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.8
https://security.netapp.com/advisory/ntap-20230824-0011/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.