#VU79485 Type Confusion in Linux kernel - CVE-2023-4194

Vulnerability identifier: #VU79485

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-4194

CWE-ID: CWE-843

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 bypass implemented security restrictions.

The vulnerability exists due to a type confusion error in TUN/TAP functionality. A local user can bypass network filters and gain unauthorized access to some resources.

The vulnerability exists due to incomplete fix for #VU72742 (CVE-2023-1076).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/
https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/
https://access.redhat.com/security/cve/CVE-2023-4194
https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/
https://bugzilla.redhat.com/show_bug.cgi?id=2229498
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/

---

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.