high
7.8
CWE
416
Advisory Published
Advisory Published
Updated

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 cve-coordination@google.com

Affected SoftwareAffected VersionHow 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<4.14.326
Linux Linux kernel>=4.15<4.19.295
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

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec

Remedy

https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

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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