CVE-2023-4623

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

06/09/2023

Last modified:

20/03/2025

Description

A use-after-free vulnerability in the Linux kernel&#39;s net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.<br /> <br /> If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.<br /> <br /> We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

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::::::::	2.6.12 (including)	4.14.327 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.295 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.257 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.195 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.132 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.53 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.4.16 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.5 (including)	6.5.3 (excluding)
cpe:2.3:o:debian:debian_linux:10.0:::::::*

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

CVE-2023-4623

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools