{"api_version":"1","generated_at":"2026-05-15T01:05:48+00:00","cve":"CVE-2026-43091","urls":{"html":"https://cve.report/CVE-2026-43091","api":"https://cve.report/api/cve/CVE-2026-43091.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43091","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43091"},"summary":{"title":"xfrm: Wait for RCU readers during policy netns exit","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-06 10:16:22","updated_at":"2026-05-08 13:16:38"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094","name":"https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028","name":"https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937","name":"https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446","name":"https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e","name":"https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43091","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43091","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e1e551bc56302b80ff930c966f9985095fb1b70d b66920a3348c0f63ba18365248fa21fbf0b3a937 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e1e551bc56302b80ff930c966f9985095fb1b70d 438b1f668ad58f46ce699bb48e4698a7839e3f9e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e1e551bc56302b80ff930c966f9985095fb1b70d 3733fce2871c9bca9dd18a1a23b1432ea215a094 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e1e551bc56302b80ff930c966f9985095fb1b70d 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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 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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.","Type":"Description","Title":"xfrm: Wait for RCU readers during policy netns exit"}]}}}