medium
6.7
CWE
125
Advisory Published
CVE Published
CVE Published
Advisory Published
Updated

CVE-2023-39192: Linux Kernel Netfilter Xtables Out-Of-Bounds Read Information Disclosure Vulnerability

First published: Wed Jul 26 2023(Updated: )

A flaw was found in the Netfilter subsystem in the Linux kernel. The xt_u32 module did not validate the fields in the xt_u32 structure. This flaw allows a local privileged attacker to trigger an out-of-bounds read by setting the size fields with a value beyond the array boundaries, leading to a crash or information disclosure.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<6.6
Redhat Enterprise Linux=8.0
Fedoraproject Fedora=38
Linux kernel
redhat/kernel<6.6
6.6
ubuntu/linux<4.15.0-220.231
4.15.0-220.231
ubuntu/linux<5.4.0-169.187
5.4.0-169.187
ubuntu/linux<5.15.0-91.101
5.15.0-91.101
ubuntu/linux<6.2.0-39.40
6.2.0-39.40
ubuntu/linux<6.6~
6.6~
ubuntu/linux<4.4.0-248.282
4.4.0-248.282
ubuntu/linux-aws<4.15.0-1163.176
4.15.0-1163.176
ubuntu/linux-aws<5.4.0-1116.126
5.4.0-1116.126
ubuntu/linux-aws<5.15.0-1051.56
5.15.0-1051.56
ubuntu/linux-aws<6.2.0-1017.17
6.2.0-1017.17
ubuntu/linux-aws<4.4.0-1125.131
4.4.0-1125.131
ubuntu/linux-aws<6.6~
6.6~
ubuntu/linux-aws<4.4.0-1163.178
4.4.0-1163.178
ubuntu/linux-aws-5.15<5.15.0-1051.56~20.04.1
5.15.0-1051.56~20.04.1
ubuntu/linux-aws-5.15<6.6~
6.6~
ubuntu/linux-aws-5.4<5.4.0-1116.126~18.04.1
5.4.0-1116.126~18.04.1
ubuntu/linux-aws-5.4<6.6~
6.6~
ubuntu/linux-aws-6.2<6.2.0-1017.17~22.04.1
6.2.0-1017.17~22.04.1
ubuntu/linux-aws-6.2<6.6~
6.6~
ubuntu/linux-aws-hwe<6.6~
6.6~
ubuntu/linux-aws-hwe<4.15.0-1163.176~16.04.1
4.15.0-1163.176~16.04.1
ubuntu/linux-azure<5.4.0-1121.128
5.4.0-1121.128
ubuntu/linux-azure<5.15.0-1053.61
5.15.0-1053.61
ubuntu/linux-azure<6.2.0-1018.18
6.2.0-1018.18
ubuntu/linux-azure<4.15.0-1172.187~14.04.1
4.15.0-1172.187~14.04.1
ubuntu/linux-azure<6.6~
6.6~
ubuntu/linux-azure<4.15.0-1172.187~16.04.1
4.15.0-1172.187~16.04.1
ubuntu/linux-azure-4.15<4.15.0-1172.187
4.15.0-1172.187
ubuntu/linux-azure-4.15<6.6~
6.6~
ubuntu/linux-azure-5.15<5.15.0-1053.61~20.04.1
5.15.0-1053.61~20.04.1
ubuntu/linux-azure-5.15<6.6~
6.6~
ubuntu/linux-azure-5.4<5.4.0-1121.128~18.04.1
5.4.0-1121.128~18.04.1
ubuntu/linux-azure-5.4<6.6~
6.6~
ubuntu/linux-azure-6.2<6.2.0-1018.18~22.04.1
6.2.0-1018.18~22.04.1
ubuntu/linux-azure-6.2<6.6~
6.6~
ubuntu/linux-azure-fde<5.15.0-1053.61.1
5.15.0-1053.61.1
ubuntu/linux-azure-fde<6.6~
6.6~
ubuntu/linux-azure-fde-5.15<5.15.0-1053.61~20.04.1.1
5.15.0-1053.61~20.04.1.1
ubuntu/linux-azure-fde-5.15<6.6~
6.6~
ubuntu/linux-azure-fde-6.2<6.2.0-1018.18~22.04.1.1
6.2.0-1018.18~22.04.1.1
ubuntu/linux-azure-fde-6.2<6.6~
6.6~
ubuntu/linux-bluefield<5.4.0-1076.82
5.4.0-1076.82
ubuntu/linux-bluefield<6.6~
6.6~
ubuntu/linux-fips<6.6~
6.6~
ubuntu/linux-gcp<5.4.0-1120.129
5.4.0-1120.129
ubuntu/linux-gcp<5.15.0-1048.56
5.15.0-1048.56
ubuntu/linux-gcp<6.2.0-1020.22
6.2.0-1020.22
ubuntu/linux-gcp<6.6~
6.6~
ubuntu/linux-gcp<4.15.0-1157.174~16.04.1
4.15.0-1157.174~16.04.1
ubuntu/linux-gcp-4.15<4.15.0-1157.174
4.15.0-1157.174
ubuntu/linux-gcp-4.15<6.6~
6.6~
ubuntu/linux-gcp-5.15<5.15.0-1048.56~20.04.1
5.15.0-1048.56~20.04.1
ubuntu/linux-gcp-5.15<6.6~
6.6~
ubuntu/linux-gcp-5.19<6.6~
6.6~
ubuntu/linux-gcp-5.4<5.4.0-1120.129~18.04.1
5.4.0-1120.129~18.04.1
ubuntu/linux-gcp-5.4<6.6~
6.6~
ubuntu/linux-gcp-6.2<6.2.0-1021.23~22.04.1
6.2.0-1021.23~22.04.1
ubuntu/linux-gke<5.15.0-1048.53
5.15.0-1048.53
ubuntu/linux-gke<6.6~
6.6~
ubuntu/linux-gkeop<5.4.0-1083.87
5.4.0-1083.87
ubuntu/linux-gkeop<5.15.0-1034.40
5.15.0-1034.40
ubuntu/linux-gkeop<6.6~
6.6~
ubuntu/linux-gkeop-5.15<5.15.0-1034.40~20.04.1
5.15.0-1034.40~20.04.1
ubuntu/linux-gkeop-5.15<6.6~
6.6~
ubuntu/linux-hwe<6.6~
6.6~
ubuntu/linux-hwe<4.15.0-220.231~16.04.1
4.15.0-220.231~16.04.1
ubuntu/linux-hwe-5.15<5.15.0-91.101~20.04.1
5.15.0-91.101~20.04.1
ubuntu/linux-hwe-5.15<6.6~
6.6~
ubuntu/linux-hwe-5.4<5.4.0-169.187~18.04.1
5.4.0-169.187~18.04.1
ubuntu/linux-hwe-5.4<6.6~
6.6~
ubuntu/linux-hwe-6.2<6.2.0-39.40~22.04.1
6.2.0-39.40~22.04.1
ubuntu/linux-hwe-6.2<6.6~
6.6~
ubuntu/linux-ibm<5.4.0-1063.68
5.4.0-1063.68
ubuntu/linux-ibm<5.15.0-1044.47
5.15.0-1044.47
ubuntu/linux-ibm<6.6~
6.6~
ubuntu/linux-ibm-5.15<5.15.0-1044.47~20.04.1
5.15.0-1044.47~20.04.1
ubuntu/linux-ibm-5.15<6.6~
6.6~
ubuntu/linux-ibm-5.4<5.4.0-1063.68~18.04.1
5.4.0-1063.68~18.04.1
ubuntu/linux-ibm-5.4<6.6~
6.6~
ubuntu/linux-intel-iotg<5.15.0-1046.52
5.15.0-1046.52
ubuntu/linux-intel-iotg<6.6~
6.6~
ubuntu/linux-intel-iotg-5.15<5.15.0-1046.52~20.04.1
5.15.0-1046.52~20.04.1
ubuntu/linux-intel-iotg-5.15<6.6~
6.6~
ubuntu/linux-iot<5.4.0-1028.29
5.4.0-1028.29
ubuntu/linux-iot<6.6~
6.6~
ubuntu/linux-kvm<4.15.0-1147.152
4.15.0-1147.152
ubuntu/linux-kvm<5.4.0-1104.111
5.4.0-1104.111
ubuntu/linux-kvm<5.15.0-1048.53
5.15.0-1048.53
ubuntu/linux-kvm<6.2.0-1018.18
6.2.0-1018.18
ubuntu/linux-kvm<6.6~
6.6~
ubuntu/linux-kvm<4.4.0-1126.136
4.4.0-1126.136
ubuntu/linux-lowlatency<5.15.0-91.101
5.15.0-91.101
ubuntu/linux-lowlatency<6.2.0-1018.18
6.2.0-1018.18
ubuntu/linux-lowlatency<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-91.101~20.04.1
5.15.0-91.101~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1018.18~22.04.1
6.2.0-1018.18~22.04.1
ubuntu/linux-lowlatency-hwe-6.2<6.6~
6.6~
ubuntu/linux-lts-xenial<4.4.0-248.282~14.04.1
4.4.0-248.282~14.04.1
ubuntu/linux-lts-xenial<6.6~
6.6~
ubuntu/linux-nvidia<5.15.0-1042.42
5.15.0-1042.42
ubuntu/linux-nvidia<6.6~
6.6~
ubuntu/linux-nvidia-6.2<6.2.0-1013.13
6.2.0-1013.13
ubuntu/linux-nvidia-6.2<6.6~
6.6~
ubuntu/linux-oem-6.1<6.1.0-1023.23
6.1.0-1023.23
ubuntu/linux-oem-6.1<6.6~
6.6~
ubuntu/linux-oracle<4.15.0-1126.137
4.15.0-1126.137
ubuntu/linux-oracle<5.4.0-1115.124
5.4.0-1115.124
ubuntu/linux-oracle<5.15.0-1049.55
5.15.0-1049.55
ubuntu/linux-oracle<6.2.0-1017.18
6.2.0-1017.18
ubuntu/linux-oracle<6.6~
6.6~
ubuntu/linux-oracle<4.15.0-1126.137~16.04.1
4.15.0-1126.137~16.04.1
ubuntu/linux-oracle-5.15<5.15.0-1049.55~20.04.1
5.15.0-1049.55~20.04.1
ubuntu/linux-oracle-5.15<6.6~
6.6~
ubuntu/linux-oracle-5.4<5.4.0-1115.124~18.04.1
5.4.0-1115.124~18.04.1
ubuntu/linux-oracle-5.4<6.6~
6.6~
ubuntu/linux-raspi<5.4.0-1100.112
5.4.0-1100.112
ubuntu/linux-raspi<5.15.0-1044.47
5.15.0-1044.47
ubuntu/linux-raspi<6.2.0-1018.20
6.2.0-1018.20
ubuntu/linux-raspi<6.6~
6.6~
ubuntu/linux-raspi-5.4<5.4.0-1100.112~18.04.1
5.4.0-1100.112~18.04.1
ubuntu/linux-raspi-5.4<6.6~
6.6~
ubuntu/linux-riscv<6.2.0-39.40.1
6.2.0-39.40.1
ubuntu/linux-riscv<6.6~
6.6~
ubuntu/linux-riscv-5.15<5.15.0-1047.51~20.04.1
5.15.0-1047.51~20.04.1
ubuntu/linux-riscv-5.15<6.6~
6.6~
ubuntu/linux-starfive<6.2.0-1010.11
6.2.0-1010.11
ubuntu/linux-starfive<6.6~
6.6~
ubuntu/linux-starfive-6.2<6.6~
6.6~
ubuntu/linux-xilinx-zynqmp<5.4.0-1035.39
5.4.0-1035.39
ubuntu/linux-xilinx-zynqmp<5.15.0-1027.31
5.15.0-1027.31
ubuntu/linux-xilinx-zynqmp<6.6~
6.6~
debian/linux<=4.19.249-2
4.19.304-1
5.10.209-2
5.10.216-1
6.1.76-1
6.1.90-1
6.7.12-1
6.8.9-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2226784

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/1b50b8a371e90a5e110f466e4ac02cf6b5f681de

Remedy

https://git.kernel.org/linus/69c5d284f67089b4750d28ff6ac6f52ec224b330

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2023-39192.

  • What is the title of this vulnerability?

    The title of this vulnerability is Linux Kernel Netfilter Xtables Out-Of-Bounds Read Information Disclosure Vulnerability.

  • What is the severity of CVE-2023-39192?

    The severity of CVE-2023-39192 is medium.

  • How can an attacker exploit this vulnerability?

    An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

  • What is the affected software?

    The affected software includes Linux Kernel versions up to 6.6, Redhat Enterprise Linux version 8.0, and Fedoraproject Fedora version 38.

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