CVE-2023-4921

CVE Details

Release Date:	2023-09-05
Impact:	Important	What is this?

Description

A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

See more information about CVE-2023-4921 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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.0
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)	ELSA-2024-1831	2024-04-22
Oracle Linux version 6 (kernel-uek)	ELSA-2024-12110	2024-02-01
Oracle Linux version 7 (kernel)	ELSA-2024-1249	2024-03-20
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12110	2024-02-01
Oracle Linux version 8 (kernel)	ELSA-2024-0897	2024-03-06
Oracle Linux version 8 (kernel)	ELSA-2024-12169	2024-02-22
Oracle Linux version 8 (kernel-uek)	ELSA-2023-13043	2023-12-13
Oracle Linux version 9 (kernel-uek)	ELSA-2023-13043	2023-12-13
Oracle VM version 3 (kernel-uek)	OVMSA-2024-0002	2024-03-01