high
7.8
CWE
416
Advisory Published
Updated

CVE-2023-3777: Use-after-free in Linux kernel's netfilter: nf_tables component

First published: Thu Aug 03 2023(Updated: )

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. When nf_tables_delrule() is flushing table rules, it is not checked whether the chain is bound and the chain's owner rule can also release the objects in certain circumstances. We recommend upgrading past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<5.9.0
Linux Linux kernel>=6.0<6.5
Debian Debian Linux=12.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Canonical Ubuntu Linux=22.04
redhat/Kernel<6.5
6.5
ubuntu/linux<5.15.0-82.91
5.15.0-82.91
ubuntu/linux<6.2.0-31.31
6.2.0-31.31
ubuntu/linux<6.5~
6.5~
ubuntu/linux-allwinner<6.5~
6.5~
ubuntu/linux-allwinner-5.19<6.5~
6.5~
ubuntu/linux-aws<5.15.0-1043.48
5.15.0-1043.48
ubuntu/linux-aws<6.2.0-1010.10
6.2.0-1010.10
ubuntu/linux-aws<6.5~
6.5~
ubuntu/linux-aws-5.0<6.5~
6.5~
ubuntu/linux-aws-5.15<5.15.0-1043.48~20.04.1
5.15.0-1043.48~20.04.1
ubuntu/linux-aws-5.15<6.5~
6.5~
ubuntu/linux-aws-5.19<6.5~
6.5~
ubuntu/linux-aws-5.4<6.5~
6.5~
ubuntu/linux-aws-6.2<6.2.0-1010.10~22.04.1
6.2.0-1010.10~22.04.1
ubuntu/linux-aws-6.2<6.5~
6.5~
ubuntu/linux-aws-hwe<6.5~
6.5~
ubuntu/linux-azure<5.15.0-1045.52
5.15.0-1045.52
ubuntu/linux-azure<6.2.0-1010.10
6.2.0-1010.10
ubuntu/linux-azure<6.5~
6.5~
ubuntu/linux-azure-4.15<6.5~
6.5~
ubuntu/linux-azure-5.15<5.15.0-1045.52~20.04.1
5.15.0-1045.52~20.04.1
ubuntu/linux-azure-5.15<6.5~
6.5~
ubuntu/linux-azure-5.4<6.5~
6.5~
ubuntu/linux-azure-6.2<6.5~
6.5~
ubuntu/linux-azure-edge<6.5~
6.5~
ubuntu/linux-azure-fde<5.15.0-1045.52
5.15.0-1045.52
ubuntu/linux-azure-fde<6.5~
6.5~
ubuntu/linux-azure-fde-5.15<5.15.0-1045.52~20.04.1
5.15.0-1045.52~20.04.1
ubuntu/linux-azure-fde-5.15<6.5~
6.5~
ubuntu/linux-azure-fde-5.19<6.5~
6.5~
ubuntu/linux-azure-fde-6.2<6.5~
6.5~
ubuntu/linux-bluefield<6.5~
6.5~
ubuntu/linux-dell300x<6.5~
6.5~
ubuntu/linux-fips<6.5~
6.5~
ubuntu/linux-gcp<5.15.0-1040.48
5.15.0-1040.48
ubuntu/linux-gcp<6.2.0-1012.12
6.2.0-1012.12
ubuntu/linux-gcp<6.5~
6.5~
ubuntu/linux-gcp-4.15<6.5~
6.5~
ubuntu/linux-gcp-5.15<5.15.0-1040.48~20.04.1
5.15.0-1040.48~20.04.1
ubuntu/linux-gcp-5.15<6.5~
6.5~
ubuntu/linux-gcp-5.19<6.5~
6.5~
ubuntu/linux-gcp-5.4<6.5~
6.5~
ubuntu/linux-gke<5.15.0-1040.45
5.15.0-1040.45
ubuntu/linux-gke<6.5~
6.5~
ubuntu/linux-gke-4.15<6.5~
6.5~
ubuntu/linux-gke-5.0<6.5~
6.5~
ubuntu/linux-gke-5.15<6.5~
6.5~
ubuntu/linux-gke-5.4<6.5~
6.5~
ubuntu/linux-gkeop<5.15.0-1026.31
5.15.0-1026.31
ubuntu/linux-gkeop<6.5~
6.5~
ubuntu/linux-gkeop-5.15<5.15.0-1026.31~20.04.1
5.15.0-1026.31~20.04.1
ubuntu/linux-gkeop-5.15<6.5~
6.5~
ubuntu/linux-gkeop-5.4<6.5~
6.5~
ubuntu/linux-hwe<6.5~
6.5~
ubuntu/linux-hwe-5.15<5.15.0-82.91~20.04.1
5.15.0-82.91~20.04.1
ubuntu/linux-hwe-5.15<6.5~
6.5~
ubuntu/linux-hwe-5.4<6.5~
6.5~
ubuntu/linux-hwe-6.2<6.2.0-31.31~22.04.1
6.2.0-31.31~22.04.1
ubuntu/linux-hwe-6.2<6.5~
6.5~
ubuntu/linux-hwe-edge<6.5~
6.5~
ubuntu/linux-ibm<5.15.0-1036.39
5.15.0-1036.39
ubuntu/linux-ibm<6.2.0-1008.8
6.2.0-1008.8
ubuntu/linux-ibm<6.5~
6.5~
ubuntu/linux-ibm-5.15<5.15.0-1036.39~20.04.1
5.15.0-1036.39~20.04.1
ubuntu/linux-ibm-5.15<6.5~
6.5~
ubuntu/linux-ibm-5.4<6.5~
6.5~
ubuntu/linux-intel-5.13<6.5~
6.5~
ubuntu/linux-intel-iotg<5.15.0-1038.43
5.15.0-1038.43
ubuntu/linux-intel-iotg<6.5~
6.5~
ubuntu/linux-intel-iotg-5.15<5.15.0-1038.43~20.04.1
5.15.0-1038.43~20.04.1
ubuntu/linux-intel-iotg-5.15<6.5~
6.5~
ubuntu/linux-iot<6.5~
6.5~
ubuntu/linux-kvm<5.15.0-1040.45
5.15.0-1040.45
ubuntu/linux-kvm<6.2.0-1011.11
6.2.0-1011.11
ubuntu/linux-kvm<6.5~
6.5~
ubuntu/linux-lowlatency<5.15.0-82.91
5.15.0-82.91
ubuntu/linux-lowlatency<6.2.0-1011.11
6.2.0-1011.11
ubuntu/linux-lowlatency<6.5~
6.5~
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-82.91~20.04.1
5.15.0-82.91~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<6.5~
6.5~
ubuntu/linux-lowlatency-hwe-5.19<6.5~
6.5~
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1011.11~22.04.1
6.2.0-1011.11~22.04.1
ubuntu/linux-lowlatency-hwe-6.2<6.5~
6.5~
ubuntu/linux-lts-xenial<6.5~
6.5~
ubuntu/linux-nvidia<5.15.0-1031.31
5.15.0-1031.31
ubuntu/linux-nvidia<6.5~
6.5~
ubuntu/linux-nvidia-6.2<6.5~
6.5~
ubuntu/linux-oem<6.5~
6.5~
ubuntu/linux-oem-5.10<6.5~
6.5~
ubuntu/linux-oem-5.14<6.5~
6.5~
ubuntu/linux-oem-5.17<6.5~
6.5~
ubuntu/linux-oem-5.6<6.5~
6.5~
ubuntu/linux-oem-6.0<6.0.0-1021.21
6.0.0-1021.21
ubuntu/linux-oem-6.0<6.5~
6.5~
ubuntu/linux-oem-6.1<6.1.0-1020.20
6.1.0-1020.20
ubuntu/linux-oem-6.1<6.5~
6.5~
ubuntu/linux-oem-osp1<6.5~
6.5~
ubuntu/linux-oracle<5.15.0-1041.47
5.15.0-1041.47
ubuntu/linux-oracle<6.2.0-1010.10
6.2.0-1010.10
ubuntu/linux-oracle<6.5~
6.5~
ubuntu/linux-oracle-5.0<6.5~
6.5~
ubuntu/linux-oracle-5.13<6.5~
6.5~
ubuntu/linux-oracle-5.15<5.15.0-1041.47~20.04.1
5.15.0-1041.47~20.04.1
ubuntu/linux-oracle-5.15<6.5~
6.5~
ubuntu/linux-oracle-5.4<6.5~
6.5~
ubuntu/linux-raspi<5.15.0-1036.39
5.15.0-1036.39
ubuntu/linux-raspi<6.2.0-1011.13
6.2.0-1011.13
ubuntu/linux-raspi<6.5~
6.5~
ubuntu/linux-raspi-5.4<6.5~
6.5~
ubuntu/linux-raspi2<6.5~
6.5~
ubuntu/linux-riscv<6.2.0-31.31.1
6.2.0-31.31.1
ubuntu/linux-riscv<6.5~
6.5~
ubuntu/linux-riscv-5.15<5.15.0-1039.43~20.04.2
5.15.0-1039.43~20.04.2
ubuntu/linux-riscv-5.15<6.5~
6.5~
ubuntu/linux-snapdragon<6.5~
6.5~
ubuntu/linux-starfive<6.2.0-1003.3
6.2.0-1003.3
ubuntu/linux-starfive<6.5~
6.5~
ubuntu/linux-starfive-5.19<6.5~
6.5~
ubuntu/linux-starfive-6.2<6.5~
6.5~
ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29
5.15.0-1025.29
ubuntu/linux-xilinx-zynqmp<6.5~
6.5~
debian/linux
4.19.249-2
4.19.304-1
5.10.209-2
5.10.205-2
6.1.76-1
6.1.85-1
6.6.15-2
6.7.12-1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8

Remedy

https://kernel.dance/6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8

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

Remedy

https://git.kernel.org/linus/d0e2c7de92c7f2b3d355ad76b0bb9fc43d1beb87

Remedy

https://git.kernel.org/linus/6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8

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