Wind River Support Network


LIN1021-6495 : Security Advisory - linux - CVE-2023-4206

Created: Sep 6, 2023    Updated: Sep 13, 2023
Resolved Date: Sep 7, 2023
Found In Version:
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Kernel


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.

CREATE(Triage):(User=admin) CVE-2023-4206 (


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