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Vulnerability · Published Aug 15, 2026 · Assigned by Linux

CVE-2026-72436netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Critical 9.8

In plain English

A critical-severity security flaw 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 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 46.2% 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: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.180-1DEBIAN-CVE-2026-72436
Debian:13linux6.12.100-1DEBIAN-CVE-2026-72436
Debian:14linux7.1.5-1DEBIAN-CVE-2026-72436
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux6.8.0-147.147UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux7.0.0-34.34UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-aws7.0.0-1013.13UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-aws-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-azure7.0.0-1017.17UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1017.17~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1016.16UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-gcp7.0.0-1013.13UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-gke7.0.0-1007.8UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-34.34~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-ibm7.0.0-1014.14UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1024.25~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2022.23UBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1014.14UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67UBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-oracle7.0.0-1012.12UBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1012.12~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-raspi7.0.0-1020.20UBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-realtime7.0.0-34.34.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-72436
Ubuntu:26.04:LTSlinux-riscv7.0.0-34.34.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-34.34.1~24.04.1UBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-72436
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-72436
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-72436

Affected products (as reported)

VendorProductVersions
Linux Linux 18f84d41d34fa35d0d64bbaea01fe664553ecc06 – before c107233d2ff4fd7cef5d02f9124b99194957a71018f84d41d34fa35d0d64bbaea01fe664553ecc06 – before 6329d3a9afe715fddda0460cfa46b496d61c2fe018f84d41d34fa35d0d64bbaea01fe664553ecc06 – before 7445fe965b7d8756070a40e80f8b73348ccda1d718f84d41d34fa35d0d64bbaea01fe664553ecc06 – before c4d257734e91bfcdc71d41843392dd6400b5bb1b18f84d41d34fa35d0d64bbaea01fe664553ecc06 – before 3219d74e4536658c937fd878a327257b86ce80dd18f84d41d34fa35d0d64bbaea01fe664553ecc06 – before e4b4984e28c16406ecb318444dea4a8bf47def3e
Linux Linux 4.2

References