CVE-2023-4208

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

06/09/2023

Last modified:

13/02/2025

Description

A use-after-free vulnerability in the Linux kernel&#39;s net/sched: cls_u32 component can be exploited to achieve local privilege escalation.<br /> <br /> When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.<br /> <br /> We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	3.18 (including)	4.14.322 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.291 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.253 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.190 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.126 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.45 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.4.10 (excluding)
cpe:2.3:o:debian:debian_linux:12.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

CVE-2023-4208

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools