high
7.8
CWE
416
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2023-31248: (Pwn2Own) Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability

First published: Wed Jul 05 2023(Updated: )

Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()` failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace

Credit: security@ubuntu.com security@ubuntu.com security@ubuntu.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel=5.9.0-rc1
Fedoraproject Fedora=37
Fedoraproject Fedora=38
Debian Debian Linux=11.0
Linux kernel
Linux Linux kernel>=5.9<5.10.188
Linux Linux kernel>=5.11<5.15.121
Linux Linux kernel>=5.16<6.1.39
Linux Linux kernel>=6.2<6.4.4
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
ubuntu/linux<5.15.0-78.85
5.15.0-78.85
ubuntu/linux<6.2.0-26.26
6.2.0-26.26
ubuntu/linux<6.5~
6.5~
ubuntu/linux-aws<5.15.0-1040.45
5.15.0-1040.45
ubuntu/linux-aws<6.2.0-1008.8
6.2.0-1008.8
ubuntu/linux-aws<6.5~
6.5~
ubuntu/linux-aws-5.0<6.5~
6.5~
ubuntu/linux-aws-5.15<5.15.0-1040.45~20.04.1
5.15.0-1040.45~20.04.1
ubuntu/linux-aws-5.15<6.5~
6.5~
ubuntu/linux-aws-5.19<5.19.0-1029.30~22.04.1
5.19.0-1029.30~22.04.1
ubuntu/linux-aws-5.19<6.5~
6.5~
ubuntu/linux-aws-5.4<6.5~
6.5~
ubuntu/linux-aws-6.2<6.5~
6.5~
ubuntu/linux-aws-hwe<6.5~
6.5~
ubuntu/linux-azure<5.15.0-1042.49
5.15.0-1042.49
ubuntu/linux-azure<6.2.0-1008.8
6.2.0-1008.8
ubuntu/linux-azure<6.5~
6.5~
ubuntu/linux-azure-4.15<6.5~
6.5~
ubuntu/linux-azure-5.15<5.15.0-1042.49~20.04.1
5.15.0-1042.49~20.04.1
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<5.15.0-1042.49
5.15.0-1042.49
ubuntu/linux-azure-fde<6.5~
6.5~
ubuntu/linux-azure-fde-5.15<5.15.0-1042.49~20.04.1
5.15.0-1042.49~20.04.1
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<5.15.0-1038.46
5.15.0-1038.46
ubuntu/linux-gcp<6.2.0-1010.10
6.2.0-1010.10
ubuntu/linux-gcp<6.5~
6.5~
ubuntu/linux-gcp-4.15<6.5~
6.5~
ubuntu/linux-gcp-5.15<5.15.0-1038.46~20.04.1
5.15.0-1038.46~20.04.1
ubuntu/linux-gcp-5.15<6.5~
6.5~
ubuntu/linux-gcp-5.19<5.19.0-1030.32~22.04.1
5.19.0-1030.32~22.04.1
ubuntu/linux-gcp-5.19<6.5~
6.5~
ubuntu/linux-gcp-5.4<6.5~
6.5~
ubuntu/linux-gke<5.15.0-1038.43
5.15.0-1038.43
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<5.15.0-1038.43~20.04.1
5.15.0-1038.43~20.04.1
ubuntu/linux-gke-5.15<6.5~
6.5~
ubuntu/linux-gke-5.4<6.5~
6.5~
ubuntu/linux-gkeop<5.15.0-1024.29
5.15.0-1024.29
ubuntu/linux-gkeop<6.5~
6.5~
ubuntu/linux-gkeop-5.15<5.15.0-1024.29~20.04.1
5.15.0-1024.29~20.04.1
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<5.15.0-78.85~20.04.1
5.15.0-78.85~20.04.1
ubuntu/linux-hwe-5.15<6.5~
6.5~
ubuntu/linux-hwe-5.19<5.19.0-50.50
5.19.0-50.50
ubuntu/linux-hwe-5.4<6.5~
6.5~
ubuntu/linux-hwe-6.2<6.2.0-26.26~22.04.1
6.2.0-26.26~22.04.1
ubuntu/linux-hwe-6.2<6.5~
6.5~
ubuntu/linux-hwe-edge<6.5~
6.5~
ubuntu/linux-ibm<5.15.0-1034.37
5.15.0-1034.37
ubuntu/linux-ibm<6.2.0-1006.6
6.2.0-1006.6
ubuntu/linux-ibm<6.5~
6.5~
ubuntu/linux-ibm-5.15<5.15.0-1034.37~20.04.1
5.15.0-1034.37~20.04.1
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<5.15.0-1036.41
5.15.0-1036.41
ubuntu/linux-intel-iotg<6.5~
6.5~
ubuntu/linux-intel-iotg-5.15<5.15.0-1036.41~20.04.1
5.15.0-1036.41~20.04.1
ubuntu/linux-intel-iotg-5.15<6.5~
6.5~
ubuntu/linux-iot<6.5~
6.5~
ubuntu/linux-kvm<5.15.0-1038.43
5.15.0-1038.43
ubuntu/linux-kvm<6.2.0-1009.9
6.2.0-1009.9
ubuntu/linux-kvm<6.5~
6.5~
ubuntu/linux-laptop<6.5~
6.5~
ubuntu/linux-lowlatency<5.15.0-78.85
5.15.0-78.85
ubuntu/linux-lowlatency<6.2.0-1009.9
6.2.0-1009.9
ubuntu/linux-lowlatency<6.5~
6.5~
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-78.85~20.04.1
5.15.0-78.85~20.04.1
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<6.5~
6.5~
ubuntu/linux-lts-xenial<6.5~
6.5~
ubuntu/linux-nvidia<5.15.0-1029.29
5.15.0-1029.29
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<5.17.0-1035.36
5.17.0-1035.36
ubuntu/linux-oem-5.17<6.5~
6.5~
ubuntu/linux-oem-5.6<6.5~
6.5~
ubuntu/linux-oem-6.0<6.0.0-1020.20
6.0.0-1020.20
ubuntu/linux-oem-6.0<6.5~
6.5~
ubuntu/linux-oem-6.1<6.1.0-1019.19
6.1.0-1019.19
ubuntu/linux-oem-6.1<6.5~
6.5~
ubuntu/linux-oem-6.5<6.5~
6.5~
ubuntu/linux-oem-osp1<6.5~
6.5~
ubuntu/linux-oracle<5.15.0-1039.45
5.15.0-1039.45
ubuntu/linux-oracle<6.2.0-1008.8
6.2.0-1008.8
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<5.15.0-1039.45~20.04.1
5.15.0-1039.45~20.04.1
ubuntu/linux-oracle-5.15<6.5~
6.5~
ubuntu/linux-oracle-5.4<6.5~
6.5~
ubuntu/linux-raspi<5.15.0-1034.37
5.15.0-1034.37
ubuntu/linux-raspi<6.2.0-1009.11
6.2.0-1009.11
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<6.5~
6.5~
ubuntu/linux-riscv-5.15<5.15.0-1037.41~20.04.2
5.15.0-1037.41~20.04.2
ubuntu/linux-riscv-5.15<6.5~
6.5~
ubuntu/linux-snapdragon<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
debian/linux-5.10
5.10.209-2~deb10u1

Remedy

https://lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/

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/837830a4b439bfeb86c70b0115c280377c84714b

Remedy

https://git.kernel.org/linus/515ad530795c118f012539ed76d02bacfd426d89

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