{"id":"CVE-2026-64123","revision":"54f1c7418e064f7688be5efa33f35a22","records":[{"revision":"54f1c7418e064f7688be5efa33f35a22","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64123","aliases":[],"title":"net: hsr: defer node table free until after RCU readers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: defer node table free until after RCU readers\n\nHSR node-list and node-status generic-netlink operations run under\nrcu_read_lock(). They walk hsr->node_db through hsr_get_next_node() and\nhsr_get_node_data(), but RTM_DELLINK teardown removes the same node table\nwith plain list_del() and frees each node immediately.\n\nThat lets a generic-netlink reader hold a struct hsr_node pointer across\nhsr_dellink(). In a KASAN build, widening the reader window after\nhsr_get_next_node() obtains the node reproduces a slab-use-after-free\nwhen the reader copies node->macaddress_A; the freeing stack is\nhsr_del_nodes() from hsr_dellink().\n\nUse list_del_rcu() and defer the free through the existing\nhsr_free_node_rcu() callback. This matches the lifetime rule used by the\nHSR prune paths, which already delete nodes with list_del_rcu() and\ncall_rcu().","state":0,"publishedAt":"2026-07-19T15:40:21.161+00:00","modifiedAt":"2026-10-19T20:28:13.256+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/hsr/hsr_framereg.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"0ea70fb46940620848c08d9d399455c9e82fecdb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"c5580114e0492bcd2e0a37613ed4c311e3fa3d4d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"7713f4aafb577ff49fa67f0488d9c7dddc64d6ce\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"6324423a8e6591f41a16c09a8f9a84e554ac147c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"48d09dea506de667eb55f939bf98eec721effbdb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"8c3af18bb0d7c921a5219194037509463eb2ffde\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9a1e627405d68d475a3c1f35e685ccfb5bbe668\",\n                            \"lessThan\": \"aaec7096f9961eb223b5b149abe9495525c205d9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08523d5a2f4a9e4202e00d282c164d453cabe2d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.2.12\",\n                            \"lessThan\": \"5.3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/hsr/hsr_framereg.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb","https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b","https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d","https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce","https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c","https://git.kernel.org/stable/c/48d09dea506de667eb55f939bf98eec721effbdb","https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde","https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64123","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64123","identifiers":["CVE-2026-64123"]},"retained":false,"historicalAffected":[]}],"coverage":[]}