CVE-2023-4207: Use-after-free in Linux kernel's net/sched: cls_fw component
First published: Wed Sep 06 2023(Updated: )
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.
Credit: cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 |
| F5 Traffix Systems Signaling Delivery Controller | >=1<=5=5.2.0 | 5.2.0 |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager | <=ISVG 10.0.2 | |
| Linux kernel | <6.5 | |
| Debian | =12.0 | |
| Linux Kernel | >=3.18<4.14.326 | |
| Linux Kernel | >=4.15<4.19.295 | |
| Linux Kernel | >=4.20<5.4.253 | |
| Linux Kernel | >=5.5<5.10.190 | |
| Linux Kernel | >=5.11<5.15.126 | |
| Linux Kernel | >=5.16<6.1.45 | |
| Linux Kernel | >=6.2<6.4.10 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec
- https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec
- https://www.debian.org/security/2023/dsa-5492
- https://git.kernel.org/linus/76e42ae831991c828cffa8c37736ebfb831ad5ec
- https://security-tracker.debian.org/tracker/CVE-2023-4207
- https://my.f5.com/manage/s/article/K000138693
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://www.ibm.com/support/pages/node/7172423 (Advisory)
Frequently Asked Questions
What is CVE-2023-4207?
CVE-2023-4207 is a use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component that can be exploited to achieve local privilege escalation.
How severe is CVE-2023-4207?
CVE-2023-4207 has a severity rating of 7.8 (High).
Which software is affected by CVE-2023-4207?
CVE-2023-4207 affects the Linux Kernel versions up to 6.5, Debian Linux 12.0, and certain versions of the 'linux' package from the Debian repository.
How can CVE-2023-4207 be fixed on Linux?
To fix CVE-2023-4207 on Linux, it is recommended to update to version 5.10.191-1, 6.1.52-1, or 6.5.3-1 of the 'linux' package provided by the Debian repository, or update to a patched version of the Linux Kernel.
Are there any references for CVE-2023-4207?
Yes, you can find references for CVE-2023-4207 at the following URLs: [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec [2] https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec [3] https://www.debian.org/security/2023/dsa-5492
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