CVE-2023-53566: netfilter: nft_set_rbtree: fix null deref on element insertion

Q: What is the severity of CVE-2023-53566?

CVE-2023-53566 has been classified as a general protection fault vulnerability within the Linux kernel.

Q: How do I fix CVE-2023-53566?

To fix CVE-2023-53566, update the Linux kernel to the latest version that contains the security patch addressing this vulnerability.

Q: What systems are affected by CVE-2023-53566?

CVE-2023-53566 affects systems running vulnerable versions of the Linux kernel that utilize netfilter.

Q: What are the potential impacts of CVE-2023-53566?

Exploitation of CVE-2023-53566 may lead to a system crash or unexpected behavior due to a null dereference.

Q: Is CVE-2023-53566 actively being exploited?

As of now, there is no public information indicating that CVE-2023-53566 is actively being exploited in the wild.

Published Oct 4, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nftsetrbtree: fix null deref on element insertion

There is no guarantee that rbprev() will not return NULL in nftrbtreegcelem():

general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] nftaddsetelem+0x14b0/0x2990 nftablesnewsetelem+0x528/0xb30

Furthermore, there is a possible use-after-free while iterating, 'node' can be free'd so we need to cache the next value to use.

Affected Software

130 affected componentsFixes available

The Linux Foundation Linux Kernel

Linux Linux kernel>=5.10.166<5.10.181

Linux Linux kernel>=5.15.91<5.15.113

Linux Linux kernel>=6.1.9<6.1.30

Linux Linux kernel>=6.2.1<6.3.4

Linux Linux kernel=6.2

Linux Linux kernel=6.2-rc6

Linux Linux kernel=6.2-rc7

Linux Linux kernel=6.2-rc8

Linux Linux kernel=6.4-rc1

Linux Linux kernel=6.4-rc2

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-5.15<5.15.0-1044.49~20.04.1

5.15.0-1044.49~20.04.1

ubuntu/linux-azure-5.15<5.15.0-1046.53~20.04.1

5.15.0-1046.53~20.04.1

ubuntu/linux-gcp-5.15<5.15.0-1041.49~20.04.1

5.15.0-1041.49~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-83.92~20.04.1

5.15.0-83.92~20.04.1

ubuntu/linux-ibm-5.15<5.15.0-1037.40~20.04.1

5.15.0-1037.40~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1040.46~20.04.1

5.15.0-1040.46~20.04.1

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-83.92~20.04.1

5.15.0-83.92~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1017.17~20.04.1

5.15.0-1017.17~20.04.1

ubuntu/linux-oracle-5.15<5.15.0-1042.48~20.04.1

5.15.0-1042.48~20.04.1

ubuntu/linux-riscv-5.15<5.15.0-1040.44~20.04.3

5.15.0-1040.44~20.04.3

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux<5.15.0-83.92

5.15.0-83.92

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1044.49

5.15.0-1044.49

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-azure<5.15.0-1046.53

5.15.0-1046.53

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-fde<5.15.0-1046.53.1

5.15.0-1046.53.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1041.49

5.15.0-1041.49

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gke<5.15.0-1041.46

5.15.0-1041.46

ubuntu/linux-gkeop<5.15.0-1027.32

5.15.0-1027.32

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1037.40

5.15.0-1037.40

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1039.45

5.15.0-1039.45

ubuntu/linux-kvm<5.15.0-1041.46

5.15.0-1041.46

ubuntu/linux-lowlatency<5.15.0-83.92

5.15.0-83.92

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-nvidia<5.15.0-1032.32

5.15.0-1032.32

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-tegra<5.15.0-1017.17

5.15.0-1017.17

ubuntu/linux-nvidia-tegra-igx<5.15.0-1004.4

5.15.0-1004.4

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1042.48

5.15.0-1042.48

ubuntu/linux-oracle-6.5*

ubuntu/linux-raspi<5.15.0-1037.40

5.15.0-1037.40

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29

5.15.0-1025.29

ubuntu/linux-bluefield<5.15.0-1023.25

5.15.0-1023.25

ubuntu/linux-intel-iot-realtime<5.15.0-1038.40

5.15.0-1038.40

ubuntu/linux-realtime<5.15.0-1045.50

5.15.0-1045.50

ubuntu/linux-fips*

ubuntu/linux-azure-6.11*

ubuntu/linux-gcp-6.11*

ubuntu/linux-hwe-6.11*

ubuntu/linux-intel*

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.8*

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1044.49~20.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1046.53~20.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1041.49~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-83.92~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1037.40~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1040.46~20.04.1
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-83.92~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1017.17~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1042.48~20.04.1
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1040.44~20.04.3
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-83.92
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1044.49
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1046.53
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1046.53.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1041.49
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1041.46
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1027.32
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.15.0-1037.40
Upgrade
Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.45
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1041.46
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-83.92
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 5.15.0-1032.32
Upgrade
Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1017.17
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1004.4
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1042.48
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1037.40
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1025.29
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.15.0-1023.25
Upgrade
Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1038.40
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1045.50

Event History

Oct 4, 2025

CVE Published

via MITRE·03:17 PM

Data Sourced

via MITRE·03:17 PM

DescriptionSeverity

Data Sourced

via OSV·04:15 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·04:15 PM

RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2023-53566?

CVE-2023-53566 has been classified as a general protection fault vulnerability within the Linux kernel.

How do I fix CVE-2023-53566?

To fix CVE-2023-53566, update the Linux kernel to the latest version that contains the security patch addressing this vulnerability.

What systems are affected by CVE-2023-53566?

CVE-2023-53566 affects systems running vulnerable versions of the Linux kernel that utilize netfilter.

What are the potential impacts of CVE-2023-53566?

Exploitation of CVE-2023-53566 may lead to a system crash or unexpected behavior due to a null dereference.

Is CVE-2023-53566 actively being exploited?

As of now, there is no public information indicating that CVE-2023-53566 is actively being exploited in the wild.

CVE-2023-53566: netfilter: nft_set_rbtree: fix null deref on element insertion

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2023-53566?

How do I fix CVE-2023-53566?

What systems are affected by CVE-2023-53566?

What are the potential impacts of CVE-2023-53566?

Is CVE-2023-53566 actively being exploited?

Company

Resources

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