high
7.8
CWE
416
CVE Published
Advisory Published
Updated

CVE-2023-4623: Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component

First published: Wed Sep 06 2023(Updated: )

A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<=2.5.75
Linux Linux kernel=2.6.12-rc1
IBM QRadar SIEM<=7.5 - 7.5.0 UP8 IF01
Linux Linux kernel>=2.6.12<4.14.327
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<6.1.53
Linux Linux kernel>=6.2<6.4.16
Linux Linux kernel>=6.5<6.5.3
Debian Debian Linux=10.0
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.112-1
6.11.5-1
6.11.7-1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f

Remedy

https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f

Remedy

https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Remedy

https://git.kernel.org/linus/b3d26c5702c7d6c45456326e56d2ccf3f103e60f

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-4623?

    CVE-2023-4623 is a use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component that can be exploited to achieve local privilege escalation.

  • How can CVE-2023-4623 be exploited?

    CVE-2023-4623 can be exploited by a local attacker to achieve privilege escalation.

  • What software is affected by CVE-2023-4623?

    The Linux kernel versions up to and including 2.5.75 and version 2.6.12-rc1 are affected by CVE-2023-4623.

  • What is the severity of CVE-2023-4623?

    CVE-2023-4623 has a severity rating of 7.8 (high).

  • How can I fix CVE-2023-4623?

    To fix CVE-2023-4623, it is recommended to update to a patched version of the Linux kernel.

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