Tracker / CVE-2023-4207
CVE-2023-4207
High 7.8
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.
Affected products and versions
| debian | debian_linux |
|---|---|
| linux | linux_kernel · 3.18 → 4.14.326 |
| linux | linux_kernel · 4.15 → 4.19.295 |
| linux | linux_kernel · 4.20 → 5.4.253 |
| linux | linux_kernel · 5.11 → 5.15.126 |
| linux | linux_kernel · 5.16 → 6.1.45 |
| linux | linux_kernel · 5.5 → 5.10.190 |
| linux | linux_kernel · 6.2 → 6.4.10 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.