Log in Start free

Vulnerability · Published Apr 13, 2026 · Assigned by Linux

CVE-2026-31414netfilter: nf_conntrack_expect: use expect->helper

Critical 9.8

In plain English

A critical-severity null pointer dereference in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 53.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.170-1DEBIAN-CVE-2026-31414
Debian:13linux6.12.85-1DEBIAN-CVE-2026-31414
Debian:14linux6.19.12-1DEBIAN-CVE-2026-31414
Ubuntu:22.04:LTSlinux5.15.0-187.197USN-8631-1
Ubuntu:22.04:LTSlinux5.15.0-187.197UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux6.8.0-136.136UBUNTU-CVE-2026-31414
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-aws5.15.0-1113.120USN-8631-1
Ubuntu:22.04:LTSlinux-aws5.15.0-1113.120UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-aws6.8.0-1061.64UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1061.64~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure5.15.0-1118.127UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure5.15.0-1118.127USN-8631-1
Ubuntu:24.04:LTSlinux-azure6.8.0-1063.71UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1022.22USN-8636-1
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1022.22UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1063.71~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1118.127UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1118.127USN-8631-1
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1062.69UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1062.69~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gcp5.15.0-1114.124USN-8661-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1114.124UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gcp6.8.0-1064.72UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1022.25UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1022.25USN-8636-1
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1064.72~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gke5.15.0-1110.116USN-8661-3
Ubuntu:22.04:LTSlinux-gke5.15.0-1110.116UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-gke6.8.0-1059.67UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1096.104UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1096.104USN-8631-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1046.50UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-42.42UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-42.42USN-8636-1
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-136.136~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-ibm5.15.0-1107.111UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-ibm5.15.0-1107.111USN-8631-1
Ubuntu:24.04:LTSlinux-ibm6.8.0-1061.62UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1061.62~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1108.114USN-8631-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1108.114UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-kvm5.15.0-1105.110USN-8631-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1105.110UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-190.200USN-8661-2
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-190.200UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-136.136.2UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-136.136.2~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1108.109USN-8631-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1108.109UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1059.62UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1031.31UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1059.62~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1059.62.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1065.67UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1065.67USN-8631-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1030.31UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1054.54UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1054.54USN-8631-3
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1032.32UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1032.32USN-8636-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-oracle5.15.0-1110.116USN-8631-2
Ubuntu:22.04:LTSlinux-oracle5.15.0-1110.116UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oracle6.8.0-1058.61UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1020.20UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1020.20USN-8636-2
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1058.61~22.04.1UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-raspi5.15.0-1108.111UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-raspi5.15.0-1108.111USN-8661-5
Ubuntu:24.04:LTSlinux-raspi6.8.0-1061.65UBUNTU-CVE-2026-31414
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-31414
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-136.136~22.04.3UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-31414
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1033.34UBUNTU-CVE-2026-31414
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1076.80USN-8631-1
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1076.80UBUNTU-CVE-2026-31414

Affected products (as reported)

VendorProductVersions
Linux Linux ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before e7ccaa0a62a8ff2be5d521299ce79390c318d306ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before 4bd1b3d839172724b33d8d02c5a4ff6a1c775417ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before b53294bff19e56ada2f230ceb8b1ffde61cc3817ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before 3dfd3f7712b5a800f2ba632179e9b738076a51f0ea781f197d6a835cbb93a0bf88ee1696296ed8aa – before f01794106042ee27e54af6fdf5b319a2fe3df94d
Linux Linux 2.6.30

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References