{"id":"CVE-2026-43091","summary":"xfrm: Wait for RCU readers during policy netns exit","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Wait for RCU readers during policy netns exit\n\nxfrm_policy_fini() frees the policy_bydst hash tables after flushing the\npolicy work items and deleting all policies, but it does not wait for\nconcurrent RCU readers to leave their read-side critical sections first.\n\nThe policy_bydst tables are published via rcu_assign_pointer() and are\nlooked up through rcu_dereference_check(), so netns teardown must also\nwait for an RCU grace period before freeing the table memory.\n\nFix this by adding synchronize_rcu() before freeing the policy hash tables.","modified":"2026-05-28T03:53:29.245409774Z","published":"2026-05-06T07:40:23.955Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43091.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094"},{"type":"WEB","url":"https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43091.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43091"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e1e551bc56302b80ff930c966f9985095fb1b70d"},{"fixed":"b66920a3348c0f63ba18365248fa21fbf0b3a937"},{"fixed":"438b1f668ad58f46ce699bb48e4698a7839e3f9e"},{"fixed":"3733fce2871c9bca9dd18a1a23b1432ea215a094"},{"fixed":"33a3149dd81a1e2f52b80ee1e0fc380b39f3d028"},{"fixed":"069daad4f2ae9c5c108131995529d5f02392c446"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43091.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43091.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}