CVE-2023-4623

CVE Details

Release Date:	2023-09-06
Impact:	Important	What is this?

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

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

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
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 6 (kernel-uek)	ELBA-2024-12467	2024-06-28
Oracle Linux version 7 (kernel)	ELSA-2024-2004	2024-04-23
Oracle Linux version 7 (kernel-uek)	ELBA-2024-12467	2024-06-28
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
Oracle VM version 3 (kernel-uek)	OVMSA-2024-0006	2024-07-03