Use-after-free in Linux kernel's net/sched: cls_u32 component
Summary
Use-after-free in Linux kernel's net/sched: cls_u32 component
Original description
The description as published by the source.
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.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2023-4208 linux Fixed in: 5.10.191-1
- Ubuntu UBUNTU-CVE-2023-4208 linux-aws Fixed in: 4.4.0-1123.129
References
- advisory github.com
- advisory nvd.nist.gov
- advisory debian.org
- patch git.kernel.org
- web git.kernel.org
- web kernel.dance
- web lists.debian.org