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. Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8 https://kernel.dance/b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2238210]
This was fixed for Fedora with the 6.4.10 stable kernel updates.
As found in https://issues.redhat.com/browse/RHEL-2802 , this one is duplicate of the flaw 2225511 (that is CVE-2023-4128). *** This bug has been marked as a duplicate of bug 2225511 ***