7.8
High
CVE-2023-4206 A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| kernel 3.18 | 3.18 → < 6.5 | 6.5 |
References
- git.kernel.org git.kernel.org
- kernel.dance kernel.dance
- www.debian.org www.debian.org
- lists.debian.org lists.debian.org
Timeline
- Published
- Last modified
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