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
Linux Linux kernel>=3.8<6.5
Linux Linux kernel=6.5-rc1
F5 Traffix SDC=5.2.0=5.1.0
IBM QRadar SIEM<=7.5 - 7.5.0 UP8 IF01
Linux Linux kernel>=3.8<4.14.322
Linux Linux kernel>=4.15<4.19.291
Linux Linux kernel>=4.20<5.4.253
Linux Linux kernel>=5.5<5.10.188
Linux Linux kernel>=5.11<5.15.121
Linux Linux kernel>=5.16<6.1.40
Linux Linux kernel>=6.2<6.4.5
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Debian Debian Linux=12.0
redhat/Kernel<6.5
6.5
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

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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