CVE-2023-4206

CVE Details

Release Date:	2023-07-29
Impact:	Important	What is this?

Description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation. When route4_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 b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

See more information about CVE-2023-4206 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-uek)	ELSA-2023-12842	2023-10-03
Oracle Linux version 7 (kernel)	ELSA-2023-7423	2023-11-22
Oracle Linux version 7 (kernel-uek)	ELSA-2023-12842	2023-10-03
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-2023-0023	2023-11-02