CVE-2026-53238: netlabel: validate unlabeled address and mask attribute lengths

Q: What is the severity of CVE-2026-53238?

CVE-2026-53238 has a risk rating of 37, indicating a moderate level of severity.

Q: What causes CVE-2026-53238?

CVE-2026-53238 is caused by inadequate validation of unlabeled address and mask attribute lengths in the Linux kernel.

Q: How do I fix CVE-2026-53238?

To fix CVE-2026-53238, update your Linux kernel to the latest patched version that addresses this vulnerability.

Q: What is the impact of CVE-2026-53238?

The impact of CVE-2026-53238 includes potential security risks due to improper handling of address and mask attributes.

Q: Is CVE-2026-53238 related to network security?

Yes, CVE-2026-53238 is related to network security as it affects how the Linux kernel manages address labeling for network operations.

Published Jun 25, 2026

Updated

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

netlabel: validate unlabeled address and mask attribute lengths

netlblunlabeladdrinfoget() used the address attribute length to determine whether the attribute data could be read as an IPv4 or IPv6 address, but did not independently validate the corresponding mask attribute length. A crafted Generic Netlink request could therefore provide a valid IPv4/IPv6 address attribute with a shorter mask attribute, which would later be read as a full struct inaddr or struct in6addr.

NLABINARY policy lengths are maximum lengths by default, so use NLAPOLICYEXACTLEN() for the unlabeled IPv4/IPv6 address and mask attributes. This rejects short attributes during policy validation and also exposes the exact length requirements through policy introspection.

Affected Software

279 affected componentsFixes available

Linux Linux kernel

Microsoft azl3 kernel 6.6.141.1-1<6.6.143.1-1

6.6.143.1-1

Linux Linux kernel>=2.6.25<5.10.259

Linux Linux kernel>=5.11<5.15.210

Linux Linux kernel>=5.16<6.1.176

Linux Linux kernel>=6.2<6.6.143

Linux Linux kernel>=6.7<6.12.94

Linux Linux kernel>=6.13<6.18.36

Linux Linux kernel>=6.19<7.0.13

Linux Linux kernel=7.1-rc1

Linux Linux kernel=7.1-rc2

Linux Linux kernel=7.1-rc3

Linux Linux kernel=7.1-rc4

Linux Linux kernel=7.1-rc5

Linux Linux kernel=7.1-rc6

Linux Linux kernel=7.1-rc7

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4*

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4*

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1117.124~20.04.1

5.15.0-1117.124~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1123.132~20.04.1

5.15.0-1123.132~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-5.15<5.15.0-1122.131~20.04.1

5.15.0-1122.131~20.04.1

ubuntu/linux-bluefield*

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ubuntu/linux-gcp-5.15<5.15.0-1118.128~20.04.1

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ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

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ubuntu/linux-gkeop*

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ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.15<5.15.0-198.208~20.04.1

5.15.0-198.208~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1111.115~20.04.1

5.15.0-1111.115~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1112.118~20.04.1

5.15.0-1112.118~20.04.1

ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-195.205~20.04.1

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ubuntu/linux-nvidia-tegra-5.15*

ubuntu/linux-oem-5.10*

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ubuntu/linux-oracle-5.8*

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ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-198.208

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ubuntu/linux-azure<5.15.0-1123.132

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ubuntu/linux-azure-fde<5.15.0-1122.131

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ubuntu/linux-azure-fde-5.19*

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ubuntu/linux-gcp<5.15.0-1118.128

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ubuntu/linux-gcp-5.19*

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ubuntu/linux-gke<5.15.0-1113.119

5.15.0-1113.119

ubuntu/linux-gkeop<5.15.0-1100.108

5.15.0-1100.108

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1111.115

5.15.0-1111.115

ubuntu/linux-ibm-6.8<6.8.0-1066.67~22.04.1

6.8.0-1066.67~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1112.118

5.15.0-1112.118

ubuntu/linux-kvm<5.15.0-1109.114

5.15.0-1109.114

ubuntu/linux-lowlatency<5.15.0-195.205

5.15.0-195.205

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-146.146.1~22.04.1

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ubuntu/linux-nvidia<5.15.0-1112.113

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ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1064.67~22.04.1

6.8.0-1064.67~22.04.1

ubuntu/linux-nvidia-tegra*

ubuntu/linux-nvidia-tegra-igx*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1114.120

5.15.0-1114.120

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-146.146~22.04.1

6.8.0-146.146~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1080.84

5.15.0-1080.84

ubuntu/linux-bluefield<5.15.0-1101.103

5.15.0-1101.103

ubuntu/linux-intel-iot-realtime<5.15.0-1109.111

5.15.0-1109.111

ubuntu/linux-realtime<5.15.0-1116.125

5.15.0-1116.125

ubuntu/linux-realtime-6.8<6.8.1-1061.62~22.04.1

6.8.1-1061.62~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1117.124+fips1

5.15.0-1117.124+fips1

ubuntu/linux-azure-fips<5.15.0-1123.132+fips1

5.15.0-1123.132+fips1

ubuntu/linux-fips<5.15.0-198.208+fips1

5.15.0-198.208+fips1

ubuntu/linux-gcp-fips<5.15.0-1118.128+fips1

5.15.0-1118.128+fips1

ubuntu/linux<6.8.0-146.146

6.8.0-146.146

ubuntu/linux-aws<6.8.0-1066.69

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ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-aws-7.0<7.0.0-1012.12~24.04.1

7.0.0-1012.12~24.04.1

ubuntu/linux-azure<6.8.0-1070.78

6.8.0-1070.78

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17*

ubuntu/linux-azure-7.0<7.0.0-1014.14~24.04.1

7.0.0-1014.14~24.04.1

ubuntu/linux-azure-fde<6.8.0-1068.75

6.8.0-1068.75

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-fde-6.17*

ubuntu/linux-azure-fde-7.0<7.0.0-1013.13~24.04.1

7.0.0-1013.13~24.04.1

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1070.78

6.8.0-1070.78

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ubuntu/linux-gcp-6.14*

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ubuntu/linux-gke<6.8.0-1065.73

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ubuntu/linux-gkeop<6.8.0-1051.55

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ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

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ubuntu/linux-ibm<6.8.0-1066.67

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ubuntu/linux-lowlatency<6.8.0-146.146.1

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ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1064.67

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ubuntu/linux-nvidia-6.17*

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7.0.0-1018.18~24.04.1

ubuntu/linux-nvidia-lowlatency<6.8.0-1064.67.1

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ubuntu/linux-nvidia-tegra*

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1063.66

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ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17*

ubuntu/linux-oracle-7.0<7.0.0-1011.11~24.04.1

7.0.0-1011.11~24.04.1

ubuntu/linux-raspi*

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-riscv-7.0<7.0.0-31.31.1~24.04.1

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ubuntu/linux-xilinx*

ubuntu/linux-bluefield<6.8.0-1032.37

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ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime<6.8.1-1061.62

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ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips<6.8.0-1066.69+fips1

6.8.0-1066.69+fips1

ubuntu/linux-azure-fips<6.8.0-1069.77+fips1

6.8.0-1069.77+fips1

ubuntu/linux-fips<6.8.0-146.146+fips1

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ubuntu/linux-gcp-fips<6.8.0-1070.78+fips1

6.8.0-1070.78+fips1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux<7.0.0-31.31

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ubuntu/linux-aws<7.0.0-1012.12

7.0.0-1012.12

ubuntu/linux-azure<7.0.0-1014.14

7.0.0-1014.14

ubuntu/linux-azure-fde<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-gcp<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-gke<7.0.0-1006.7

7.0.0-1006.7

ubuntu/linux-ibm<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-nvidia<7.0.0-1018.18

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ubuntu/linux-nvidia-bos<7.0.0-2018.18

7.0.0-2018.18

ubuntu/linux-oem-7.0<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-oracle<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-raspi<7.0.0-1019.19

7.0.0-1019.19

ubuntu/linux-realtime<7.0.0-31.31.1

7.0.0-31.31.1

ubuntu/linux-riscv<7.0.0-31.31.1

7.0.0-31.31.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 6.6.143.1-1
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Fixed in 5.15.0-1117.124~20.04.1
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Fixed in 5.15.0-1123.132~20.04.1
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Fixed in 5.15.0-1122.131~20.04.1
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Fixed in 5.15.0-1118.128~20.04.1
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Fixed in 5.15.0-198.208~20.04.1
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Fixed in 5.15.0-1111.115~20.04.1
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Fixed in 5.15.0-1112.118~20.04.1
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Fixed in 5.15.0-195.205~20.04.1
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Fixed in 5.15.0-1114.120~20.04.1
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Fixed in 5.15.0-1111.115~20.04.1
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Fixed in 5.15.0-198.208
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Fixed in 5.15.0-1117.124
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Fixed in 6.8.0-1066.69~22.04.1
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Fixed in 5.15.0-1123.132
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Fixed in 6.8.0-1070.78~22.04.1
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Fixed in 5.15.0-1122.131
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Fixed in 6.8.0-1068.75~22.04.1
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Fixed in 5.15.0-1118.128
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Fixed in 5.15.0-1113.119
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Fixed in 5.15.0-1111.115
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Fixed in 6.8.0-1066.67~22.04.1
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Fixed in 5.15.0-1112.118
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Fixed in 5.15.0-1109.114
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Fixed in 5.15.0-195.205
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Fixed in 6.8.0-146.146.1~22.04.1
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Fixed in 5.15.0-1112.113
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Fixed in 5.15.0-1114.120
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Fixed in 6.8.0-146.146~22.04.1
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Fixed in 5.15.0-1080.84
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Fixed in 5.15.0-1101.103
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Fixed in 5.15.0-1116.125
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Fixed in 6.8.1-1061.62~22.04.1
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Fixed in 5.15.0-1117.124+fips1
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Fixed in 5.15.0-1123.132+fips1
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Fixed in 5.15.0-198.208+fips1
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Fixed in 5.15.0-1118.128+fips1
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Fixed in 6.8.0-146.146
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Fixed in 6.8.0-1066.69
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Fixed in 7.0.0-1012.12~24.04.1
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Fixed in 6.8.0-1070.78
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Fixed in 7.0.0-1014.14~24.04.1
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Fixed in 6.8.0-1068.75
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Fixed in 7.0.0-1013.13~24.04.1
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Fixed in 6.8.0-1070.78
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 6.8.0-1065.73
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Fixed in 6.8.0-1051.55
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Fixed in 7.0.0-31.31~24.04.1
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Fixed in 6.8.0-1066.67
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Fixed in 6.8.0-146.146.1
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Fixed in 6.8.0-1064.67
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Fixed in 7.0.0-1018.18~24.04.1
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Fixed in 6.8.0-1064.67.1
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Fixed in 6.8.0-1063.66
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 7.0.0-31.31.1~24.04.1
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Fixed in 6.8.0-1032.37
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Fixed in 6.8.1-1061.62
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Fixed in 6.8.0-1066.69+fips1
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Fixed in 6.8.0-1069.77+fips1
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Fixed in 6.8.0-146.146+fips1
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Fixed in 6.8.0-1070.78+fips1
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Fixed in 7.0.0-31.31
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Fixed in 7.0.0-1012.12
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Fixed in 7.0.0-1014.14
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1011.11
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Fixed in 7.0.0-1006.7
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1018.18
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Fixed in 7.0.0-2018.18
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1011.11
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Fixed in 7.0.0-1019.19
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Fixed in 7.0.0-31.31.1
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Fixed in 7.0.0-31.31.1
Configuration
Use NLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask attributes so short attributes are rejected during policy validation.
Linux kernel netlabel Unlabeled IPv4/IPv6 address and mask attribute policies = NLA_POLICY_EXACT_LEN()

Event History

Jun 25, 2026

CVE Published

via MITRE·08:39 AM

Data Sourced

via MITRE·08:39 AM

Description

Data Sourced

via OSV·09:16 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·09:16 AM

RemedyDescriptionSeverityAffected Software

Jun 27, 2026

Data Sourced

via Microsoft·08:06 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-53238?

CVE-2026-53238 has a risk rating of 37, indicating a moderate level of severity.

What causes CVE-2026-53238?

CVE-2026-53238 is caused by inadequate validation of unlabeled address and mask attribute lengths in the Linux kernel.

How do I fix CVE-2026-53238?

To fix CVE-2026-53238, update your Linux kernel to the latest patched version that addresses this vulnerability.

What is the impact of CVE-2026-53238?

The impact of CVE-2026-53238 includes potential security risks due to improper handling of address and mask attributes.

Is CVE-2026-53238 related to network security?

Yes, CVE-2026-53238 is related to network security as it affects how the Linux kernel manages address labeling for network operations.

CVE-2026-53238: netlabel: validate unlabeled address and mask attribute lengths

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-53238?

What causes CVE-2026-53238?

How do I fix CVE-2026-53238?

What is the impact of CVE-2026-53238?

Is CVE-2026-53238 related to network security?

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