{"id":"CVE-2026-72436","title":"netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types\n\nSashiko pointed out that there are a few lockless RCU readers\nusing test_bit() which is a …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c107233d2ff4fd7cef5d02f9124b99194957a710","Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 6329d3a9afe715fddda0460cfa46b496d61c2fe0","Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 7445fe965b7d8756070a40e80f8b73348ccda1d7","Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c4d257734e91bfcdc71d41843392dd6400b5bb1b","Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 3219d74e4536658c937fd878a327257b86ce80dd","Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < e4b4984e28c16406ecb318444dea4a8bf47def3e","Linux 4.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:49:57.755944Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:24.058Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72436","references":[{"url":"https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710"},{"url":"https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0"},{"url":"https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7"},{"url":"https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b"},{"url":"https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd"},{"url":"https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e"}],"tags":["cve.org"],"epss":0.00721,"epssPercentile":0.5301,"ingestedAt":"2026-10-16T19:46:24.395Z","slug":"CVE-2026-72436","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types\n\nSashiko pointed out that there are a few lockless RCU readers\nusing test_bit() which is a relaxed atomic operation and\nprovides no memory barrier guarantees. Use test_bit_acquire()\ninstead where the operation may run parallel with add/del/gc,\ni.e. is not one from the next cases\n\n- protected by region lock\n- in a set destroy phase\n- in a new/temporary set creation phase\n\n## Affected\n\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c107233d2ff4fd7cef5d02f9124b99194957a710`\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 6329d3a9afe715fddda0460cfa46b496d61c2fe0`\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 7445fe965b7d8756070a40e80f8b73348ccda1d7`\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c4d257734e91bfcdc71d41843392dd6400b5bb1b`\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 3219d74e4536658c937fd878a327257b86ce80dd`\n- `Linux >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06 < e4b4984e28c16406ecb318444dea4a8bf47def3e`\n- `Linux 4.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}