{"id":"CVE-2026-72436","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72436","summary":"netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types","details":"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 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","published":"2026-08-15T05:56:50.051Z","modified":"2026-08-18T03:56:55.814589957Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.1.178"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72436.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72436"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:55.814589957Z"}}