{"api_version":"1","generated_at":"2026-07-20T14:43:30+00:00","cve":"CVE-2026-64123","urls":{"html":"https://cve.report/CVE-2026-64123","api":"https://cve.report/api/cve/CVE-2026-64123.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64123","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64123"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:53","updated_at":"2026-07-19 16:17:53"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde","name":"https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b","name":"https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c","name":"https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce","name":"https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9","name":"https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d","name":"https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb","name":"https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64123","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64123","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 0ea70fb46940620848c08d9d399455c9e82fecdb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 c5580114e0492bcd2e0a37613ed4c311e3fa3d4d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 7713f4aafb577ff49fa67f0488d9c7dddc64d6ce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 6324423a8e6591f41a16c09a8f9a84e554ac147c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 8c3af18bb0d7c921a5219194037509463eb2ffde git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b9a1e627405d68d475a3c1f35e685ccfb5bbe668 aaec7096f9961eb223b5b149abe9495525c205d9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 08523d5a2f4a9e4202e00d282c164d453cabe2d2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.2.12 5.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/hsr/hsr_framereg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0ea70fb46940620848c08d9d399455c9e82fecdb","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"c5580114e0492bcd2e0a37613ed4c311e3fa3d4d","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"7713f4aafb577ff49fa67f0488d9c7dddc64d6ce","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"6324423a8e6591f41a16c09a8f9a84e554ac147c","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"8c3af18bb0d7c921a5219194037509463eb2ffde","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"lessThan":"aaec7096f9961eb223b5b149abe9495525c205d9","status":"affected","version":"b9a1e627405d68d475a3c1f35e685ccfb5bbe668","versionType":"git"},{"status":"affected","version":"08523d5a2f4a9e4202e00d282c164d453cabe2d2","versionType":"git"},{"lessThan":"5.3","status":"affected","version":"5.2.12","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/hsr/hsr_framereg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.3"},{"lessThan":"5.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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()."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:21.161Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb"},{"url":"https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b"},{"url":"https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d"},{"url":"https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce"},{"url":"https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c"},{"url":"https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde"},{"url":"https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9"}],"title":"net: hsr: defer node table free until after RCU readers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64123","datePublished":"2026-07-19T15:40:21.161Z","dateReserved":"2026-07-19T07:54:57.036Z","dateUpdated":"2026-07-19T15:40:21.161Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:53","lastModifiedDate":"2026-07-19 16:17:53","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64123","Ordinal":"1","Title":"net: hsr: defer node table free until after RCU readers","CVE":"CVE-2026-64123","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64123","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"net: hsr: defer node table free until after RCU readers"}]}}}