high
7.8
CWE
416
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2023-4206: Use-after-free in Linux kernel's net/sched: cls_route component

First published: Tue Jul 25 2023(Updated: )

A flaw in the Linux Kernel found. Use after free in the net/sched classifiers (cls_fw, cls_u32 and cls_route) can happen because of mainline/net/sched/cls_fw.c incorrect handling of the existing filter in .change method that leads to an extra unbind_tcf call for the associated class and that allows that class to be removed while it's still used. These bugs can be used for a local privilege escalation. Upstream patch: <a href="https://lore.kernel.org/netdev/193d6cdf-d6c9-f9be-c36a-b2a7551d5fb6@mojatatu.com/">https://lore.kernel.org/netdev/193d6cdf-d6c9-f9be-c36a-b2a7551d5fb6@mojatatu.com/</a>

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
redhat/Kernel<6.5
6.5
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

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8

Remedy

https://kernel.dance/b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-4206?

    CVE-2023-4206 is a use-after-free vulnerability in the Linux kernel's net/sched: cls_route component that can be exploited to achieve local privilege escalation.

  • How can CVE-2023-4206 be exploited?

    CVE-2023-4206 can be exploited by calling route4_change() on an existing filter, which causes a problem with the tcf_result struct that is copied into the new instance of the filter.

  • What is the severity of CVE-2023-4206?

    The severity of CVE-2023-4206 is high with a CVSS score of 7.8.

  • Which software versions are affected by CVE-2023-4206?

    Linux Kernel versions up to 6.5 and Debian Linux versions 12.0 are affected by CVE-2023-4206.

  • How can I fix CVE-2023-4206?

    To fix CVE-2023-4206, update your Linux Kernel to version 6.5.3-1 or newer, or update your Debian Linux to version 12.0 or newer.

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