{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-72436 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-72436 is a critical vulnerability in Linux, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-72436 and fix it if it is affected.\n\nWhat it is: CVE-2026-72436 is a critical vulnerability in Linux, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-72436 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-72436/ (Markdown: https://insights.sbomify.com/CVE-2026-72436/index.md)","id":"CVE-2026-72436","markdown":"https://insights.sbomify.com/CVE-2026-72436/index.md","name":"CVE-2026-72436","record":{"aliases":["BELL-CVE-2026-72436","DEBIAN-CVE-2026-72436","GHSA-6x4x-6p4p-6f5f","UBUNTU-CVE-2026-72436"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["other"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel netfilter","requires_auth":"none","summary":"A race condition in Linux kernel ipset hash types due to missing memory barriers in lockless RCU readers could lead to undefined behavior.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"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","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types","id":"CVE-2026-72436","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"race_condition","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry","id":"CVE-2026-72437"},"packages":[],"prev":{"headline":"netfilter: ipset: fix order of kfree_rcu() and rcu_assign_pointer()","id":"CVE-2026-72435"},"products":["Linux"],"published":"2026-08-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-16","vendors":["Linux"]},"summary":"A race condition in Linux kernel ipset hash types due to missing memory barriers in lockless RCU readers could lead to undefined behavior.","url":"https://insights.sbomify.com/CVE-2026-72436/"}