7.8
CWE
416
EPSS
0.042%
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2023-3776: Use-after-free in Linux kernel's net/sched: cls_fw component

First published: Fri Jul 21 2023(Updated: )

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=2.6<6.5
Linux Linux kernel=6.5-rc1
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Debian Debian Linux=12.0
redhat/Kernel<6.5
6.5
F5 Traffix SDC=5.2.0=5.1.0
5.2.0
ubuntu/linux<4.15.0-216.227
4.15.0-216.227
ubuntu/linux<5.4.0-159.176
5.4.0-159.176
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<3.13.0-193.244
3.13.0-193.244
ubuntu/linux<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux<4.4.0-244.278
4.4.0-244.278
ubuntu/linux-allwinner<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-allwinner-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws<4.15.0-1160.173
4.15.0-1160.173
ubuntu/linux-aws<5.4.0-1108.116
5.4.0-1108.116
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<4.4.0-1122.128
4.4.0-1122.128
ubuntu/linux-aws<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws<4.4.0-1160.175
4.4.0-1160.175
ubuntu/linux-aws-5.0<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-5.4<5.4.0-1108.116~18.04.1
5.4.0-1108.116~18.04.1
ubuntu/linux-aws-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-fips<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-hwe<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-aws-hwe<4.15.0-1160.173~16.04.1
4.15.0-1160.173~16.04.1
ubuntu/linux-azure<5.4.0-1114.120
5.4.0-1114.120
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<4.15.0-1169.184~14.04.1
4.15.0-1169.184~14.04.1
ubuntu/linux-azure<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure<4.15.0-1169.184~16.04.1
4.15.0-1169.184~16.04.1
ubuntu/linux-azure-4.15<4.15.0-1169.184
4.15.0-1169.184
ubuntu/linux-azure-4.15<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-6.2<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-edge<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-fde<5.15.0-1045.52.1
5.15.0-1045.52.1
ubuntu/linux-azure-fde<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-fde-5.15<5.15.0-1046.53~20.04.1.1
5.15.0-1046.53~20.04.1.1
ubuntu/linux-azure-fde-5.15<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-fde-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-fde-6.2<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-azure-fips<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-bluefield<5.4.0-1070.76
5.4.0-1070.76
ubuntu/linux-bluefield<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-dell300x<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-fips<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp<5.4.0-1111.120
5.4.0-1111.120
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp<4.15.0-1154.171~16.04.1
4.15.0-1154.171~16.04.1
ubuntu/linux-gcp-4.15<4.15.0-1154.171
4.15.0-1154.171
ubuntu/linux-gcp-4.15<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp-5.4<5.4.0-1111.120~18.04.1
5.4.0-1111.120~18.04.1
ubuntu/linux-gcp-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gcp-fips<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gke<5.15.0-1040.45
5.15.0-1040.45
ubuntu/linux-gke<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gke-4.15<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gke-5.0<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gke-5.15<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gke-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gkeop<5.4.0-1075.79
5.4.0-1075.79
ubuntu/linux-gkeop<5.15.0-1026.31
5.15.0-1026.31
ubuntu/linux-gkeop<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-gkeop-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-hwe<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-hwe<4.15.0-216.227~16.04.1
4.15.0-216.227~16.04.1
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-hwe-5.4<5.4.0-159.176~18.04.1
5.4.0-159.176~18.04.1
ubuntu/linux-hwe-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-hwe-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-hwe-edge<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-ibm<5.4.0-1056.61
5.4.0-1056.61
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-ibm-5.4<5.4.0-1056.61~18.04.1
5.4.0-1056.61~18.04.1
ubuntu/linux-ibm-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-intel<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-intel-5.13<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-intel-iotg<5.15.0-1038.43
5.15.0-1038.43
ubuntu/linux-intel-iotg<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-iot<5.4.0-1021.22
5.4.0-1021.22
ubuntu/linux-iot<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-kvm<4.15.0-1144.149
4.15.0-1144.149
ubuntu/linux-kvm<5.4.0-1097.103
5.4.0-1097.103
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-kvm<4.4.0-1123.133
4.4.0-1123.133
ubuntu/linux-laptop<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-lowlatency-hwe-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-lowlatency-hwe-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-lts-xenial<4.4.0-244.278~14.04.1
4.4.0-244.278~14.04.1
ubuntu/linux-lts-xenial<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-nvidia<5.15.0-1031.31
5.15.0-1031.31
ubuntu/linux-nvidia<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-nvidia-6.2<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-nvidia-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-5.10<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-5.14<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-5.17<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-5.6<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-6.0<6.0.0-1021.21
6.0.0-1021.21
ubuntu/linux-oem-6.0<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-6.1<6.1.0-1019.19
6.1.0-1019.19
ubuntu/linux-oem-6.1<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-6.8<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oem-osp1<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oracle<4.15.0-1123.134
4.15.0-1123.134
ubuntu/linux-oracle<5.4.0-1107.116
5.4.0-1107.116
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oracle<4.15.0-1123.134~16.04.1
4.15.0-1123.134~16.04.1
ubuntu/linux-oracle-5.0<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oracle-5.13<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oracle-5.4<5.4.0-1107.116~18.04.1
5.4.0-1107.116~18.04.1
ubuntu/linux-oracle-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-oracle-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-raspi<5.4.0-1092.103
5.4.0-1092.103
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-raspi-5.4<5.4.0-1092.103~18.04.1
5.4.0-1092.103~18.04.1
ubuntu/linux-raspi-5.4<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-raspi2<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-riscv<6.2.0-31.31.1
6.2.0-31.31.1
ubuntu/linux-riscv<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
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~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-riscv-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-snapdragon<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-starfive<6.2.0-1003.3
6.2.0-1003.3
ubuntu/linux-starfive<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-starfive-5.19<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-starfive-6.2<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-starfive-6.5<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
ubuntu/linux-xilinx-zynqmp<5.4.0-1028.32
5.4.0-1028.32
ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29
5.15.0-1025.29
ubuntu/linux-xilinx-zynqmp<6.5~<5.4.251<5.15.121
6.5~
5.4.251
5.15.121
debian/linux
5.10.218-1
6.1.94-1
6.1.90-1
6.9.8-1
6.9.9-1

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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