CVE-2026-64123

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64123", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:21.161Z", "dateUpdated": "2026-10-19T20:28:13.256Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-15T10:08:03.582Z"}, "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()."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local netlink access: generic-netlink HSR_C_GET_NODE_LIST/HSR_C_GET_NODE_STATUS and rtnetlink RTM_DELLINK. The bug is not reachable via HSR/PRP network frames despite HSR being a network redundancy protocol.\nAC:L - The attacker controls both sides of the race by issuing concurrent GENL node queries and RTM_DELLINK on separate threads; no unpredictable victim state or memory layout is required beyond having an HSR interface configured.\nPR:L - Reliable exploitation requires CAP_NET_ADMIN to delete the HSR device via RTM_DELLINK (and typically to create it); CAP_NET_ADMIN is obtainable by an unprivileged user through user namespaces (unshare -Urn), and the GENL read operations themselves carry no admin-perm flag.\nUI:N - No victim interaction is required; the race is triggered entirely by the attacker's own concurrent netlink operations.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a slab use-after-free on struct hsr_node; freed objects can be reallocated and read through fields like macaddress_A/B and block_buf, enabling arbitrary kernel memory disclosure.\nI:H - UAF on a kmalloc'd hsr_node with spinlock and pointer fields (block_buf, seq_blocks) provides standard heap-spray primitives for arbitrary kernel writes and potential code execution.\nA:H - Use-after-free on hsr_node during RCU-protected traversal causes kernel oops/panic even without full exploitation, as confirmed by KASAN on the macaddress_A copy path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/hsr/hsr_framereg.c"], "versions": [{"version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "0ea70fb46940620848c08d9d399455c9e82fecdb", "status": "affected", "versionType": "git"}, {"version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b", "status": 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"versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", 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"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/48d09dea506de667eb55f939bf98eec721effbdb"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64123", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:36:43.824256Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use 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{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "net: hsr: defer node table free until after RCU readers", "metrics": [{"cvssV3_1": {"version": "3.1", "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"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local netlink access: generic-netlink HSR_C_GET_NODE_LIST/HSR_C_GET_NODE_STATUS and rtnetlink RTM_DELLINK. The bug is not reachable via HSR/PRP network frames despite HSR being a network redundancy protocol.\nAC:L - The attacker controls both sides of the race by issuing concurrent GENL node queries and RTM_DELLINK on separate threads; no unpredictable victim state or memory layout is required beyond having an HSR interface configured.\nPR:L - Reliable exploitation requires CAP_NET_ADMIN to delete the HSR device via RTM_DELLINK (and typically to create it); CAP_NET_ADMIN is obtainable by an unprivileged user through user namespaces (unshare -Urn), and the GENL read operations themselves carry no admin-perm flag.\nUI:N - No victim interaction is required; the race is triggered entirely by the attacker's own concurrent netlink operations.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a slab use-after-free on struct hsr_node; freed objects can be reallocated and read through fields like macaddress_A/B and block_buf, enabling arbitrary kernel memory disclosure.\nI:H - UAF on a kmalloc'd hsr_node with spinlock and pointer fields (block_buf, seq_blocks) provides standard heap-spray primitives for arbitrary kernel writes and potential code execution.\nA:H - Use-after-free on hsr_node during RCU-protected traversal causes kernel oops/panic even without full exploitation, as confirmed by KASAN on the macaddress_A copy path."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "0ea70fb46940620848c08d9d399455c9e82fecdb", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "c5580114e0492bcd2e0a37613ed4c311e3fa3d4d", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "7713f4aafb577ff49fa67f0488d9c7dddc64d6ce", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "6324423a8e6591f41a16c09a8f9a84e554ac147c", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "48d09dea506de667eb55f939bf98eec721effbdb", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "8c3af18bb0d7c921a5219194037509463eb2ffde", "versionType": "git"}, {"status": "affected", "version": "b9a1e627405d68d475a3c1f35e685ccfb5bbe668", "lessThan": "aaec7096f9961eb223b5b149abe9495525c205d9", "versionType": "git"}, {"status": "affected", "version": "08523d5a2f4a9e4202e00d282c164d453cabe2d2", "versionType": "git"}, {"status": "affected", "version": "5.2.12", "lessThan": "5.3", "versionType": "semver"}], "programFiles": ["net/hsr/hsr_framereg.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.3"}, {"status": "unaffected", "version": "0", "lessThan": "5.3", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.57", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/hsr/hsr_framereg.c"], "defaultStatus": "affected"}], "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/48d09dea506de667eb55f939bf98eec721effbdb"}, {"url": "https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde"}, {"url": "https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9"}], "x_generator": {"engine": "bippy-1.2.0"}, "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()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.57", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.11", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.2.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-15T10:08:03.582Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64123", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:36:43.824256Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-10-16T15:36:44.387Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-64123", "state": "PUBLISHED", "dateUpdated": "2026-10-15T10:08:03.582Z", "dateReserved": "2026-07-19T07:54:57.036Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T15:40:21.161Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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()."}], "id": "CVE-2026-64123", "lastModified": "2026-10-19T21:17:24.790", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64123", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:36:43.824256Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:53.907", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ea70fb46940620848c08d9d399455c9e82fecdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48d09dea506de667eb55f939bf98eec721effbdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6324423a8e6591f41a16c09a8f9a84e554ac147c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7713f4aafb577ff49fa67f0488d9c7dddc64d6ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8be6685cdd1255bcc85f9b59e4bfc313aefc5c1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c3af18bb0d7c921a5219194037509463eb2ffde"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aaec7096f9961eb223b5b149abe9495525c205d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c5580114e0492bcd2e0a37613ed4c311e3fa3d4d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: hsr: defer node table free until after RCU readers", "id": "2502590", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502590"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's High-availability Seamless Redundancy (HSR) networking component. When HSR node-list and node-status operations are performed, a generic-netlink reader might retain a pointer to a freed node table. This can lead to a use-after-free vulnerability, potentially allowing an attacker to cause a denial of service or information disclosure."], "name": "CVE-2026-64123", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64123\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64123\nhttps://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64123-fbd9@gregkh/T"], "threat_severity": "Moderate"}

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