CVE-2026-52927: netfilter: ebtables: fix OOB read in compat_mtw_from_user

Q: What is the severity of CVE-2026-52927?

CVE-2026-52927 has a risk score of 37, indicating a moderate severity level.

Q: What does CVE-2026-52927 affect?

CVE-2026-52927 affects the netfilter ebtables component of the Linux kernel.

Q: How do I fix CVE-2026-52927?

To fix CVE-2026-52927, update your Linux kernel to the latest version that includes the patch for this vulnerability.

Q: What type of vulnerability is CVE-2026-52927?

CVE-2026-52927 is an out-of-bounds read vulnerability in the compat_mtw_from_user function.

Q: When was CVE-2026-52927 published?

CVE-2026-52927 was published on June 24, 2026.

Published Jun 24, 2026

Updated

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

netfilter: ebtables: fix OOB read in compatmtwfromuser

Luxiao Xu says:

The function compatmtwfromuser() converts ebtables extensions from 32-bit user structures to kernel native structures. However, it lacks proper validation of the user-supplied matchsize/targetsize.

When certain extensions are processed, the kernel-side translation logic may perform memory accesses based on the extension's expected size. If the user provides a size smaller than what the extension requires, it results in an out-of-bounds read as reported by KASAN.

This fix introduces a check to ensure matchsize is at least as large as the extension's required compatsize. This covers matches, watchers, and targets, while maintaining compatibility with standard targets.

AFAIU this is relevant for matches that need to go though match->compatfromuser() call. Those that use plain memcpy with the user-provided size are ok because the caller checks that size vs the start of the next rule entry offset (which itself is checked vs. total size copied from userspace).

The ->compatfromuser() callbacks assume they can read compatsize bytes, so they need this extra check.

Based on an earlier patch from Luxiao Xu.

Affected Software

277 affected componentsFixes available

Linux Foundation Linux kernel (netfilter/ebtables)

Microsoft azl3 kernel 6.6.141.1-1<6.6.143.1-1

6.6.143.1-1

Linux Linux kernel>=2.6.34<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<6.12.93

Linux Linux kernel>=6.13<6.18.35

Linux Linux kernel>=6.19<7.0.12

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

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*

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ubuntu/linux-oem*

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ubuntu/linux-azure-fips*

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ubuntu/linux-intel-5.13*

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

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ubuntu/linux-gkeop<5.15.0-1100.108

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ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

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ubuntu/linux-ibm<5.15.0-1111.115

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

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ubuntu/linux-intel-iot-realtime*

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ubuntu/linux-kvm<5.15.0-1109.114

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ubuntu/linux-lowlatency<5.15.0-195.205

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ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

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ubuntu/linux-nvidia<5.15.0-1112.113

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ubuntu/linux-nvidia-6.2*

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ubuntu/linux-nvidia-tegra<5.15.0-1070.72

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ubuntu/linux-nvidia-tegra-igx<5.15.0-1059.59

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ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

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ubuntu/linux-oracle<5.15.0-1114.120

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ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

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ubuntu/linux-starfive-5.19*

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ubuntu/linux-aws-fips*

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ubuntu/linux-azure-fde<6.8.0-1068.75

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ubuntu/linux-realtime*

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ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

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ubuntu/linux-aws*

ubuntu/linux-azure*

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ubuntu/linux-raspi*

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ubuntu/linux-riscv<7.0.0-28.28.1

7.0.0-28.28.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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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 5.15.0-1070.72~20.04.1
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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 5.15.0-195.205
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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 7.0.0-1014.14~24.04.1
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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 6.8.0-1065.73
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Fixed in 6.8.0-1051.55
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Fixed in 7.0.0-28.28~24.04.1
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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 7.0.0-1016.16~24.04.1
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Fixed in 6.8.0-1064.67.1
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Fixed in 6.8.0-1036.39
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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 7.0.0-28.28.1~24.04.3
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Fixed in 6.8.0-1008.8
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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 7.0.0-28.28
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1010.10
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1008.8
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Fixed in 7.0.0-1003.4
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Fixed in 7.0.0-1010.10
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Fixed in 7.0.0-1016.16
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Fixed in 7.0.0-2016.16
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Fixed in 7.0.0-1009.9
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Fixed in 7.0.0-1008.8
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Fixed in 7.0.0-1015.15
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Fixed in 7.0.0-28.28.1
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Fixed in 7.0.0-28.28.1

Event History

Jun 24, 2026

CVE Published

via MITRE·07:14 AM

Data Sourced

via MITRE·07:14 AM

DescriptionSeverity

Data Sourced

via OSV·08:16 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·08:16 AM

RemedyDescriptionSeverityWeaknessAffected Software

Jun 27, 2026

Data Sourced

via Microsoft·08:16 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-52927?

CVE-2026-52927 has a risk score of 37, indicating a moderate severity level.

What does CVE-2026-52927 affect?

CVE-2026-52927 affects the netfilter ebtables component of the Linux kernel.

How do I fix CVE-2026-52927?

To fix CVE-2026-52927, update your Linux kernel to the latest version that includes the patch for this vulnerability.

What type of vulnerability is CVE-2026-52927?

CVE-2026-52927 is an out-of-bounds read vulnerability in the compat_mtw_from_user function.

When was CVE-2026-52927 published?

CVE-2026-52927 was published on June 24, 2026.

CVE-2026-52927: netfilter: ebtables: fix OOB read in compat_mtw_from_user

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-52927?

What does CVE-2026-52927 affect?

How do I fix CVE-2026-52927?

What type of vulnerability is CVE-2026-52927?

When was CVE-2026-52927 published?

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