CVE-2026-31424: netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP

Q: What is the severity of CVE-2026-31424?

The severity of CVE-2026-31424 is medium with a base score of 5.5.

Q: How do I fix CVE-2026-31424?

To fix CVE-2026-31424, update your Linux kernel to the patched version that addresses the vulnerability.

Q: What impact does CVE-2026-31424 have on systems?

CVE-2026-31424 may allow a denial of service due to a null pointer dereference vulnerability in the netfilter x_tables subsystem.

Q: Which software versions are affected by CVE-2026-31424?

CVE-2026-31424 affects the Linux kernel and specifically the netfilter x_tables functionality.

Q: Who reported the vulnerability CVE-2026-31424?

CVE-2026-31424 was reported by researcher Weiming Shi.

Published Apr 13, 2026

Updated

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

netfilter: xtables: restrict xtcheckmatch/xtchecktarget extensions for NFPROTOARP

Weiming Shi says:

xtmatch and xttarget structs registered with NFPROTOUNSPEC can be loaded by any protocol family through nftcompat. When such a match/target sets .hooks to restrict which hooks it may run on, the bitmask uses NFINET constants. This is only correct for families whose hook layout matches NFINET: IPv4, IPv6, INET, and bridge all share the same five hooks (PREROUTING ... POSTROUTING).

ARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different semantics. Because NFARPOUT == 1 == NFINETLOCALIN, the .hooks validation silently passes for the wrong reasons, allowing matches to run on ARP chains where the hook assumptions (e.g. state->in being set on input hooks) do not hold. This leads to NULL pointer dereferences; xtdevgroup is one concrete example:

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227] RIP: 0010:devgroupmt+0xff/0x350 Call Trace: <TASK> nftmatcheval (net/netfilter/nftcompat.c:407) nftdochain (net/netfilter/nftablescore.c:285) nftdochainarp (net/netfilter/nftchainfilter.c:61) nfhookslow (net/netfilter/core.c:623) arpxmit (net/ipv4/arp.c:666) </TASK> Kernel panic - not syncing: Fatal exception in interrupt

Fix it by restricting arptables to NFPROTOARP extensions only. Note that arptables-legacy only supports:

- arptCLASSIFY - arptmangle - arptMARK

that provide explicit NFPROTOARP match/target declarations.

Affected Software

268 affected componentsFixes available

Linux Linux kernel (netfilter x_tables)

Microsoft azl3 kernel 6.6.130.1-3

Patch available

Linux Linux kernel>=2.6.39<5.10.253

Linux Linux kernel>=5.11<5.15.203

Linux Linux kernel>=5.16<6.1.168

Linux Linux kernel>=6.2<6.6.134

Linux Linux kernel>=6.7<6.12.81

Linux Linux kernel>=6.13<6.18.22

Linux Linux kernel>=6.19<6.19.12

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

ubuntu/linux*

ubuntu/linux-aws*

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ubuntu/linux-azure-fde-5.19*

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ubuntu/linux-gcp-5.19*

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ubuntu/linux-gkeop<5.15.0-1095.103

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ubuntu/linux-hwe-6.5*

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ubuntu/linux-intel-iot-realtime*

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5.15.0-1064.66

ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53

5.15.0-1053.53

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

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ubuntu/linux-oracle<5.15.0-1109.115

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ubuntu/linux-oracle-6.5*

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ubuntu/linux-raspi<5.15.0-1106.109

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ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

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ubuntu/linux-riscv-6.8<6.8.0-136.136~22.04.3

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ubuntu/linux-starfive-5.19*

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6.8.0-1063.71

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ubuntu/linux-oem-6.11*

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ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

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ubuntu/linux-realtime-6.17*

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ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-nvidia<7.0.0-1006.6

7.0.0-1006.6

linux/kernel>=2.6.39<5.10.253

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5.15.203

linux/kernel>=5.16.0<6.1.168

6.1.168

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6.6.134

linux/kernel>=6.7.0<6.12.81

6.12.81

linux/kernel>=6.13.0<6.18.22

6.18.22

linux/kernel>=6.19.0<6.19.12

6.19.12

debian/linux<6.1.170-1

6.1.170-1

debian/linux<6.12.85-1

6.12.85-1

debian/linux<6.19.12-1

6.19.12-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
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Fixed in 5.15.0-1112.119~20.04.1
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Fixed in 5.15.0-1117.126~20.04.1
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Fixed in 5.15.0-1117.126~20.04.2
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Fixed in 5.15.0-1112.122~20.04.1
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Fixed in 5.15.0-186.196~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-1107.113~20.04.1
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Fixed in 5.15.0-184.194~20.04.1
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Fixed in 5.15.0-1064.66~20.04.1
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Fixed in 5.15.0-1109.115~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-186.196
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Fixed in 5.15.0-1112.119
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Fixed in 6.8.0-1061.64~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1063.71~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1062.69~22.04.1
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Fixed in 5.15.0-1112.122
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Fixed in 6.8.0-1064.72~22.04.1
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Fixed in 5.15.0-1108.114
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Fixed in 6.8.0-136.136~22.04.1
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Fixed in 5.15.0-1106.110
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Fixed in 6.8.0-1061.62~22.04.1
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Fixed in 5.15.0-1107.113
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Fixed in 5.15.0-1104.109
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Fixed in 5.15.0-184.194
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Fixed in 6.8.0-136.136.2~22.04.1
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Fixed in 5.15.0-1107.108
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Fixed in 6.8.0-1059.62~22.04.1
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Fixed in 5.15.0-1064.66
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Fixed in 5.15.0-1053.53
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Fixed in 5.15.0-1109.115
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Fixed in 6.8.0-1058.61~22.04.1
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Fixed in 5.15.0-1106.109
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Fixed in 6.8.0-136.136~22.04.3
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Fixed in 5.15.0-1075.79
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Fixed in 5.15.0-1096.98
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Fixed in 5.15.0-1104.106
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Fixed in 5.15.0-1111.120
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Fixed in 6.8.1-1056.57~22.04.2
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Fixed in 5.15.0-1112.119+fips1
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Fixed in 5.15.0-1117.126+fips1
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Fixed in 5.15.0-186.196+fips1
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Fixed in 5.15.0-1112.122+fips1
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Fixed in 6.8.0-136.136
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Fixed in 6.8.0-1064.72
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Fixed in 6.8.0-1059.67
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Fixed in 6.8.0-1046.50
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Fixed in 6.8.0-1061.62
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Fixed in 6.8.0-136.136.2
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Fixed in 6.8.0-1059.62
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Fixed in 6.8.0-1059.62.1
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Fixed in 6.8.0-1030.31
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Fixed in 6.8.0-1058.61
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Fixed in 6.8.0-1061.65
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Fixed in 6.8.0-1033.34
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Fixed in 6.8.0-1028.33
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Fixed in 6.8.0-2050.52
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Fixed in 6.8.1-1056.57
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Fixed in 6.8.0-1061.64+fips1
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Fixed in 6.8.0-1063.71+fips2
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Fixed in 6.8.0-136.136+fips2
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Fixed in 6.8.0-1064.72+fips1
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Fixed in 7.0.0-1006.6
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Fixed in 5.10.253
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Fixed in 5.15.203
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Fixed in 6.1.168
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Fixed in 6.6.134
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Fixed in 6.12.81
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Fixed in 6.18.22
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Fixed in 6.19.12
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Fixed in 6.1.170-1
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Fixed in 6.12.85-1
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Fixed in 6.19.12-1
Configuration
Restrict arptables to extensions with explicit NFPROTO_ARP match/target declarations; arptables-legacy supports arpt_CLASSIFY, arpt_mangle, and arpt_MARK.
arptables allowed extensions = NFPROTO_ARP only

Event History

Apr 13, 2026

CVE Published

via MITRE·01:40 PM

Data Sourced

via MITRE·01:40 PM

Description

Data Sourced

via OSV·01:40 PM

DescriptionAffected Software

Data Sourced

via OSV·02:16 PM

Severity

Data Sourced

via NVD·02:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Apr 14, 2026

Data Sourced

via Microsoft·08:01 AM

DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-31424?

The severity of CVE-2026-31424 is medium with a base score of 5.5.

How do I fix CVE-2026-31424?

To fix CVE-2026-31424, update your Linux kernel to the patched version that addresses the vulnerability.

What impact does CVE-2026-31424 have on systems?

CVE-2026-31424 may allow a denial of service due to a null pointer dereference vulnerability in the netfilter x_tables subsystem.

Which software versions are affected by CVE-2026-31424?

CVE-2026-31424 affects the Linux kernel and specifically the netfilter x_tables functionality.

Who reported the vulnerability CVE-2026-31424?

CVE-2026-31424 was reported by researcher Weiming Shi.

CVE-2026-31424: netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-31424?

How do I fix CVE-2026-31424?

What impact does CVE-2026-31424 have on systems?

Which software versions are affected by CVE-2026-31424?

Who reported the vulnerability CVE-2026-31424?

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