CVE-2023-4208
Use-after-free in Linux kernel's net/sched: cls_u32 component
HIGH 7.8EPSS 0.3%
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.
- Affected
- Linux · Kernel
- CVSS v3.1 NVD
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.31% chance of exploitation in the next 30 days, 23rd percentile
- Published
- 2023-09-06
- Updated
- 2025-02-13
Exploit collections (2)
- linux/kernelctf/CVE-2023-4208_lts_cos_mitigationgoogle/security-research
- linux/kernelctf/CVE-2023-4208_lts_cos_mitigation_2google/security-research
Security advisories
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3044b16e7c6…
- https://kernel.dance/3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://www.debian.org/security/2023/dsa-5492