{"id":"CVE-2026-72436","title":"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 …","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","cwe":["CWE-362"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9"],"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:17:30.500","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72436","references":[{"url":"https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72436.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-72436"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2516356"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72436"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72436"},{"url":"https://kernelcve.org/list/?q=CVE-2026-72436"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72436-eb00@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00712,"epssPercentile":0.53399,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:49:57.755944Z"},"scores":{"nvd":9.8,"vendor":5.9,"cna":9.8},"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## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72436.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":230305,"id":"CVE-2026-72436","ts":1793130916689,"field":"cvss","old":"5.9","new":"9.8"},{"seq":230304,"id":"CVE-2026-72436","ts":1793130916689,"field":"severity","old":"medium","new":"critical"},{"seq":229336,"id":"CVE-2026-72436","ts":1793019691844,"field":"cvss","old":"9.8","new":"5.9"},{"seq":229335,"id":"CVE-2026-72436","ts":1793019691844,"field":"severity","old":"critical","new":"medium"}]}