CVE-2023-4208
A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.
When u32_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 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.
| Software | From | Fixed in |
|---|---|---|
| debian / debian_linux | 12.0 | 12.0.x |
| linux / linux_kernel | 4.15 | 4.19.291 |
| linux / linux_kernel | 6.2 | 6.4.10 |
| linux / linux_kernel | 5.16 | 6.1.45 |
| linux / linux_kernel | 5.11 | 5.15.126 |
| linux / linux_kernel | 5.5 | 5.10.190 |
| linux / linux_kernel | 4.20 | 5.4.253 |
| linux / linux_kernel | 3.18 | 4.14.322 |
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