CVE-2023-4207

CVE Details

Release Date:

2023-07-29

Description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. When fw_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. We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

See more information about CVE-2023-4207 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 6 (kernel-uek)	ELSA-2023-13019	2023-12-06
Oracle Linux version 7 (kernel)	ELSA-2023-7423	2023-11-22
Oracle Linux version 7 (kernel-uek)	ELSA-2023-13019	2023-12-06
Oracle Linux version 8 (kernel)	ELSA-2023-7077	2023-11-17
Oracle Linux version 9 (kernel)	ELSA-2023-6583	2023-11-12
Oracle VM version 3 (kernel-uek)	OVMSA-2023-0025	2023-12-07

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