CVE-2023-4623

CVE Details

Release Date:

2023-09-06

Description

A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.\nIf 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.\nWe recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

See more information about CVE-2023-4623 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	7.8	Base Metrics:	AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Access Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	High
Integrity Impact:	High	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel)	ELSA-2024-2004	2024-04-23
Oracle Linux version 7 (kernel-uek)	ELSA-2023-13039	2023-12-11
Oracle Linux version 8 (kernel)	ELSA-2024-0897	2024-03-06
Oracle Linux version 8 (kernel)	ELSA-2024-12187	2024-02-29
Oracle Linux version 8 (kernel-uek)	ELSA-2023-13043	2023-12-13
Oracle Linux version 9 (kernel)	ELSA-2024-0461	2024-03-07
Oracle Linux version 9 (kernel)	ELSA-2024-12149	2024-02-09
Oracle Linux version 9 (kernel-uek)	ELSA-2023-13043	2023-12-13

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team