7.8
CWE
416 362
Advisory Published
CVE Published
Updated

CVE-2023-4244: Use After Free

First published: Mon Aug 28 2023(Updated: )

A use-after-free flaw was found in nftables sub-component due to a race problem between set GC and transaction in the Linux Kernel. This flaw could allow a local attacker to crash the system, due to missing call to to `nft_set_elem_mark_busy` causing double deactivation of the element. This vulnerability could even lead to a kernel information leak problem. Refer: <a href="https://lore.kernel.org/netdev/20230810070830.24064-1-pablo@netfilter.org/">https://lore.kernel.org/netdev/20230810070830.24064-1-pablo@netfilter.org/</a> <a href="https://lore.kernel.org/netdev/20230815223011.7019-1-fw@strlen.de/">https://lore.kernel.org/netdev/20230815223011.7019-1-fw@strlen.de/</a>

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<6.5
Debian Debian Linux=10.0
ubuntu/linux<5.4.0-173.191
5.4.0-173.191
ubuntu/linux<5.15.0-87.97
5.15.0-87.97
ubuntu/linux<6.2.0-35.35
6.2.0-35.35
ubuntu/linux<6.5.0-13.13
6.5.0-13.13
ubuntu/linux<6.6~
6.6~
ubuntu/linux-allwinner-5.19<6.6~
6.6~
ubuntu/linux-aws<5.4.0-1120.130
5.4.0-1120.130
ubuntu/linux-aws<5.15.0-1048.53
5.15.0-1048.53
ubuntu/linux-aws<6.2.0-1014.14
6.2.0-1014.14
ubuntu/linux-aws<6.5.0-1010.10
6.5.0-1010.10
ubuntu/linux-aws<6.6~
6.6~
ubuntu/linux-aws-5.15<5.15.0-1048.53~20.04.1
5.15.0-1048.53~20.04.1
ubuntu/linux-aws-5.15<6.6~
6.6~
ubuntu/linux-aws-5.4<5.4.0-1120.130~18.04.1
5.4.0-1120.130~18.04.1
ubuntu/linux-aws-5.4<6.6~
6.6~
ubuntu/linux-aws-6.2<6.2.0-1014.14~22.04.1
6.2.0-1014.14~22.04.1
ubuntu/linux-aws-6.2<6.6~
6.6~
ubuntu/linux-aws-hwe<6.6~
6.6~
ubuntu/linux-azure<5.4.0-1126.133
5.4.0-1126.133
ubuntu/linux-azure<5.15.0-1050.57
5.15.0-1050.57
ubuntu/linux-azure<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-azure<6.5.0-1009.9
6.5.0-1009.9
ubuntu/linux-azure<6.6~
6.6~
ubuntu/linux-azure-4.15<6.6~
6.6~
ubuntu/linux-azure-5.15<5.15.0-1050.57~20.04.1
5.15.0-1050.57~20.04.1
ubuntu/linux-azure-5.15<6.6~
6.6~
ubuntu/linux-azure-5.4<5.4.0-1126.133~18.04.1
5.4.0-1126.133~18.04.1
ubuntu/linux-azure-5.4<6.6~
6.6~
ubuntu/linux-azure-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-azure-6.2<6.6~
6.6~
ubuntu/linux-azure-fde<5.15.0-1050.57
5.15.0-1050.57
ubuntu/linux-azure-fde<6.6~
6.6~
ubuntu/linux-azure-fde-5.15<5.15.0-1050.57~20.04.1
5.15.0-1050.57~20.04.1
ubuntu/linux-azure-fde-5.15<6.6~
6.6~
ubuntu/linux-azure-fde-5.19<6.6~
6.6~
ubuntu/linux-azure-fde-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-azure-fde-6.2<6.6~
6.6~
ubuntu/linux-bluefield<5.4.0-1080.87
5.4.0-1080.87
ubuntu/linux-bluefield<5.15.0-1028.30
5.15.0-1028.30
ubuntu/linux-bluefield<6.6~
6.6~
ubuntu/linux-fips<6.6~
6.6~
ubuntu/linux-gcp<5.4.0-1124.133
5.4.0-1124.133
ubuntu/linux-gcp<5.15.0-1045.53
5.15.0-1045.53
ubuntu/linux-gcp<6.2.0-1017.19
6.2.0-1017.19
ubuntu/linux-gcp<6.5.0-1010.10
6.5.0-1010.10
ubuntu/linux-gcp<6.6~
6.6~
ubuntu/linux-gcp-4.15<6.6~
6.6~
ubuntu/linux-gcp-5.15<5.15.0-1045.53~20.04.2
5.15.0-1045.53~20.04.2
ubuntu/linux-gcp-5.15<6.6~
6.6~
ubuntu/linux-gcp-5.19<6.6~
6.6~
ubuntu/linux-gcp-5.4<5.4.0-1124.133~18.04.1
5.4.0-1124.133~18.04.1
ubuntu/linux-gcp-5.4<6.6~
6.6~
ubuntu/linux-gcp-6.2<6.2.0-1017.19~22.04.1
6.2.0-1017.19~22.04.1
ubuntu/linux-gke<5.15.0-1045.50
5.15.0-1045.50
ubuntu/linux-gke<6.6~
6.6~
ubuntu/linux-gkeop<5.4.0-1087.91
5.4.0-1087.91
ubuntu/linux-gkeop<5.15.0-1031.37
5.15.0-1031.37
ubuntu/linux-gkeop<6.6~
6.6~
ubuntu/linux-gkeop-5.15<5.15.0-1031.37~20.04.1
5.15.0-1031.37~20.04.1
ubuntu/linux-gkeop-5.15<6.6~
6.6~
ubuntu/linux-hwe<6.6~
6.6~
ubuntu/linux-hwe-5.15<5.15.0-87.97~20.04.1
5.15.0-87.97~20.04.1
ubuntu/linux-hwe-5.15<6.6~
6.6~
ubuntu/linux-hwe-5.4<5.4.0-173.191~18.04.1
5.4.0-173.191~18.04.1
ubuntu/linux-hwe-5.4<6.6~
6.6~
ubuntu/linux-hwe-6.2<6.2.0-35.35~22.04.1
6.2.0-35.35~22.04.1
ubuntu/linux-hwe-6.2<6.6~
6.6~
ubuntu/linux-hwe-6.5<6.6~
6.6~
ubuntu/linux-ibm<5.4.0-1067.72
5.4.0-1067.72
ubuntu/linux-ibm<5.15.0-1041.44
5.15.0-1041.44
ubuntu/linux-ibm<6.6~
6.6~
ubuntu/linux-ibm-5.15<5.15.0-1041.44~20.04.1
5.15.0-1041.44~20.04.1
ubuntu/linux-ibm-5.15<6.6~
6.6~
ubuntu/linux-ibm-5.4<5.4.0-1067.72~18.04.1
5.4.0-1067.72~18.04.1
ubuntu/linux-ibm-5.4<6.6~
6.6~
ubuntu/linux-intel-iotg<5.15.0-1043.49
5.15.0-1043.49
ubuntu/linux-intel-iotg<6.6~
6.6~
ubuntu/linux-intel-iotg-5.15<5.15.0-1043.49~20.04.1
5.15.0-1043.49~20.04.1
ubuntu/linux-intel-iotg-5.15<6.6~
6.6~
ubuntu/linux-iot<5.4.0-1032.33
5.4.0-1032.33
ubuntu/linux-iot<6.6~
6.6~
ubuntu/linux-kvm<5.4.0-1108.115
5.4.0-1108.115
ubuntu/linux-kvm<5.15.0-1045.50
5.15.0-1045.50
ubuntu/linux-kvm<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-kvm<6.6~
6.6~
ubuntu/linux-laptop<6.5.0-1006.9
6.5.0-1006.9
ubuntu/linux-laptop<6.6~
6.6~
ubuntu/linux-lowlatency<5.15.0-87.96
5.15.0-87.96
ubuntu/linux-lowlatency<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-lowlatency<6.5.0-13.13.1
6.5.0-13.13.1
ubuntu/linux-lowlatency<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-87.96~20.04.1
5.15.0-87.96~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-5.19<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-lowlatency-hwe-6.2<6.6~
6.6~
ubuntu/linux-lowlatency-hwe-6.5<6.6~
6.6~
ubuntu/linux-lts-xenial<6.6~
6.6~
ubuntu/linux-nvidia<5.15.0-1039.39
5.15.0-1039.39
ubuntu/linux-nvidia<6.6~
6.6~
ubuntu/linux-nvidia-6.2<6.2.0-1011.11
6.2.0-1011.11
ubuntu/linux-nvidia-6.2<6.6~
6.6~
ubuntu/linux-oem-5.17<6.6~
6.6~
ubuntu/linux-oem-6.0<6.6~
6.6~
ubuntu/linux-oem-6.1<6.1.0-1025.25
6.1.0-1025.25
ubuntu/linux-oem-6.1<6.6~
6.6~
ubuntu/linux-oem-6.5<6.5.0-1008.8
6.5.0-1008.8
ubuntu/linux-oem-6.5<6.6~
6.6~
ubuntu/linux-oracle<5.4.0-1119.128
5.4.0-1119.128
ubuntu/linux-oracle<5.15.0-1046.52
5.15.0-1046.52
ubuntu/linux-oracle<6.2.0-1014.14
6.2.0-1014.14
ubuntu/linux-oracle<6.5.0-1012.12
6.5.0-1012.12
ubuntu/linux-oracle<6.6~
6.6~
ubuntu/linux-oracle-5.15<5.15.0-1046.52~20.04.1
5.15.0-1046.52~20.04.1
ubuntu/linux-oracle-5.15<6.6~
6.6~
ubuntu/linux-oracle-5.4<5.4.0-1119.128~18.04.1
5.4.0-1119.128~18.04.1
ubuntu/linux-oracle-5.4<6.6~
6.6~
ubuntu/linux-raspi<5.4.0-1104.116
5.4.0-1104.116
ubuntu/linux-raspi<5.15.0-1041.44
5.15.0-1041.44
ubuntu/linux-raspi<6.2.0-1015.17
6.2.0-1015.17
ubuntu/linux-raspi<6.5.0-1007.9
6.5.0-1007.9
ubuntu/linux-raspi<6.6~
6.6~
ubuntu/linux-raspi-5.4<5.4.0-1104.116~18.04.1
5.4.0-1104.116~18.04.1
ubuntu/linux-raspi-5.4<6.6~
6.6~
ubuntu/linux-riscv<6.2.0-35.35.1
6.2.0-35.35.1
ubuntu/linux-riscv<6.5.0-13.13.1
6.5.0-13.13.1
ubuntu/linux-riscv<6.6~
6.6~
ubuntu/linux-riscv-5.15<5.15.0-1044.48~20.04.1
5.15.0-1044.48~20.04.1
ubuntu/linux-riscv-5.15<6.6~
6.6~
ubuntu/linux-starfive<6.2.0-1007.8
6.2.0-1007.8
ubuntu/linux-starfive<6.5.0-1004.5
6.5.0-1004.5
ubuntu/linux-starfive<6.6~
6.6~
ubuntu/linux-starfive-6.2<6.2.0-1007.8~22.04.1
6.2.0-1007.8~22.04.1
ubuntu/linux-starfive-6.2<6.6~
6.6~
ubuntu/linux-xilinx-zynqmp<5.4.0-1039.43
5.4.0-1039.43
ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29
5.15.0-1025.29
ubuntu/linux-xilinx-zynqmp<6.6~
6.6~
redhat/Kernel<6.5
6.5
debian/linux<=4.19.249-2
4.19.304-1
5.10.209-2
5.10.218-1
6.1.76-1
6.1.90-1
6.7.12-1
6.8.12-1
debian/linux-5.10
5.10.216-1~deb10u1

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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Reference Links

Frequently Asked Questions

  • What is CVE-2023-4244?

    CVE-2023-4244 is a use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component.

  • How can CVE-2023-4244 be exploited?

    CVE-2023-4244 can be exploited to achieve local privilege escalation.

  • What is the severity of CVE-2023-4244?

    CVE-2023-4244 has a severity rating of 7.8 (high).

  • What software is affected by CVE-2023-4244?

    CVE-2023-4244 affects the Linux kernel version 6.5 and below.

  • Is there a fix for CVE-2023-4244?

    Yes, a fix for CVE-2023-4244 is available. Please refer to the provided references for more information on the fix.

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