CVE-2026-64123 (GCVE-0-2026-64123)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-10-19 20:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hsr: defer node table free until after RCU readers HSR node-list and node-status generic-netlink operations run under rcu_read_lock(). They walk hsr->node_db through hsr_get_next_node() and hsr_get_node_data(), but RTM_DELLINK teardown removes the same node table with plain list_del() and frees each node immediately. That lets a generic-netlink reader hold a struct hsr_node pointer across hsr_dellink(). In a KASAN build, widening the reader window after hsr_get_next_node() obtains the node reproduces a slab-use-after-free when the reader copies node->macaddress_A; the freeing stack is hsr_del_nodes() from hsr_dellink(). Use list_del_rcu() and defer the free through the existing hsr_free_node_rcu() callback. This matches the lifetime rule used by the HSR prune paths, which already delete nodes with list_del_rcu() and call_rcu().
References
Impacted products
Vendor Product Version
Linux Linux Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Version: 08523d5a2f4a9e4202e00d282c164d453cabe2d2
Version: 5.2.12   ≤
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    "datePublished": "2026-07-19T15:40:21.161Z",
    "dateReserved": "2026-07-19T07:54:57.036Z",
    "dateUpdated": "2026-10-19T20:28:13.256Z",
    "state": "PUBLISHED"
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UAF on a kmalloc\u0027d 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-\u003enode_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-\u003emacaddress_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\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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