CVE-2023-4208: Use-after-free in Linux kernel's net/sched: cls_u32 component
First published: Wed Sep 06 2023(Updated: )
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.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.5 | |
| Debian Debian Linux | =12.0 | |
| debian/linux | <=4.19.249-2<=4.19.289-2 | 5.10.197-1 5.10.191-1 6.1.66-1 6.1.69-1 6.5.13-1 6.6.9-1 |
| Linux Linux kernel | >=3.18<4.14.322 | |
| Linux Linux kernel | >=4.15<4.19.291 | |
| Linux Linux kernel | >=4.20<5.4.253 | |
| Linux Linux kernel | >=5.5<5.10.190 | |
| Linux Linux kernel | >=5.11<5.15.126 | |
| Linux Linux kernel | >=5.16<6.1.45 | |
| Linux Linux kernel | >=6.2<6.4.10 | |
| F5 Traffix SDC | >=1<=5=5.2.0 | 5.2.0 |
| IBM QRadar SIEM | <=7.5 - 7.5.0 UP8 IF01 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81
- https://kernel.dance/3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81
- https://www.debian.org/security/2023/dsa-5492
- https://git.kernel.org/linus/3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81
- https://security-tracker.debian.org/tracker/CVE-2023-4208
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://my.f5.com/manage/s/article/K000138693
- https://exchange.xforce.ibmcloud.com/vulnerabilities/265423
- https://www.ibm.com/support/pages/node/7150684 (Advisory)
Frequently Asked Questions
What is CVE-2023-4208?
CVE-2023-4208 is a use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component.
How can CVE-2023-4208 be exploited?
CVE-2023-4208 can be exploited to achieve local privilege escalation.
What is the severity of CVE-2023-4208?
The severity of CVE-2023-4208 is high with a CVSS score of 7.8.
Which software is affected by CVE-2023-4208?
Linux Kernel versions up to and including 6.5, Debian Linux 12.0, and specific versions of the linux package from the Debian source are affected by CVE-2023-4208.
How do I fix the CVE-2023-4208 vulnerability?
To fix the CVE-2023-4208 vulnerability, upgrade to Linux Kernel version 6.5.3-1 or apply the provided patches for the specific affected software.
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