high
7.8
CWE
416
CVE Published
Advisory Published
Updated

CVE-2023-4921: Use-after-free in Linux kernel's net/sched: sch_qfq component

First published: Tue Sep 12 2023(Updated: )

A flaw in the Linux Kernel found. A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). References: <a href="https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8">https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8</a>

Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=3.8<6.6
IBM QRadar SIEM<=7.5 - 7.5.0 UP8 IF01
Linux Linux kernel>=3.8<4.14.326
Linux Linux kernel>=4.15<4.19.295
Linux Linux kernel>=4.20<5.4.257
Linux Linux kernel>=5.5<5.10.195
Linux Linux kernel>=5.11<5.15.132
Linux Linux kernel>=5.16<6.1.54
Linux Linux kernel>=6.2<6.5.4
Debian Debian Linux=10.0
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.112-1
6.11.7-1
6.11.9-1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8

Remedy

https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-4921?

    CVE-2023-4921 is a use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component that can be exploited to achieve local privilege escalation.

  • How severe is CVE-2023-4921?

    CVE-2023-4921 has a severity rating of 7.8 (high).

  • Which software is affected by CVE-2023-4921?

    CVE-2023-4921 affects the Linux Kernel versions 3.8 to 6.6.

  • How can CVE-2023-4921 be exploited?

    CVE-2023-4921 can be exploited by sending network packets when the plug qdisc is used as a class of the qfq qdisc, triggering a use-after-free vulnerability in qfq_dequeue().

  • Are there any references for CVE-2023-4921?

    Yes, you can find references for CVE-2023-4921 at the following links: [Link 1](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8) and [Link 2](https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8).

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