high
7.8
CWE
787
Advisory Published
Advisory Published
Updated

CVE-2023-3611: Out-of-bounds write in Linux kernel's net/sched: sch_qfq component

First published: Fri Jul 21 2023(Updated: )

A flaw in the Linux Kernel found. An out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64</a>

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

Affected SoftwareAffected VersionHow to fix
redhat/Kernel<6.5
6.5
F5 Traffix Systems Signaling Delivery Controller=5.2.0=5.1.0
Linux Kernel>=3.8<6.5
Linux Kernel=6.5-rc1
Linux Kernel>=3.8<4.14.322
Linux Kernel>=4.15<4.19.291
Linux Kernel>=4.20<5.4.253
Linux Kernel>=5.5<5.10.188
Linux Kernel>=5.11<5.15.121
Linux Kernel>=5.16<6.1.40
Linux Kernel>=6.2<6.4.5
Debian GNU/Linux=10.0
Debian GNU/Linux=11.0
Debian GNU/Linux=12.0
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1
Debian=10.0
Debian=11.0
Debian=12.0
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64

Remedy

https://kernel.dance/3e337087c3b5805fe0b8a46ba622a962880b5d64

Remedy

If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-3611?

    CVE-2023-3611 is a local privilege escalation vulnerability found in the Linux Kernel's sch_qfq component.

  • How do I fix CVE-2023-3611?

    To fix CVE-2023-3611, update to the patched version of the Linux Kernel 6.5 or later, or apply the relevant updates provided by your Linux distribution.

  • Which Linux Kernel versions are affected by CVE-2023-3611?

    CVE-2023-3611 affects Linux Kernel versions prior to 6.5, including versions 3.8 through 6.4.5.

  • Can CVE-2023-3611 be exploited remotely?

    No, CVE-2023-3611 is a local privilege escalation vulnerability that requires local access to exploit.

  • What components of Linux are impacted by CVE-2023-3611?

    CVE-2023-3611 specifically impacts the sch_qfq component within the Linux Kernel.

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