{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2022-48865",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix kernel panic when enabling bearer\n\nWhen enabling a bearer on a node, a kernel panic is observed:\n\n[    4.498085] RIP: 0010:tipc_mon_prep+0x4e/0x130 [tipc]\n...\n[    4.520030] Call Trace:\n[    4.520689]  <IRQ>\n[    4.521236]  tipc_link_build_proto_msg+0x375/0x750 [tipc]\n[    4.522654]  tipc_link_build_state_msg+0x48/0xc0 [tipc]\n[    4.524034]  __tipc_node_link_up+0xd7/0x290 [tipc]\n[    4.525292]  tipc_rcv+0x5da/0x730 [tipc]\n[    4.526346]  ? __netif_receive_skb_core+0xb7/0xfc0\n[    4.527601]  tipc_l2_rcv_msg+0x5e/0x90 [tipc]\n[    4.528737]  __netif_receive_skb_list_core+0x20b/0x260\n[    4.530068]  netif_receive_skb_list_internal+0x1bf/0x2e0\n[    4.531450]  ? dev_gro_receive+0x4c2/0x680\n[    4.532512]  napi_complete_done+0x6f/0x180\n[    4.533570]  virtnet_poll+0x29c/0x42e [virtio_net]\n...\n\nThe node in question is receiving activate messages in another\nthread after changing bearer status to allow message sending/\nreceiving in current thread:\n\n         thread 1           |              thread 2\n         --------           |              --------\n                            |\ntipc_enable_bearer()        |\n  test_and_set_bit_lock()   |\n    tipc_bearer_xmit_skb()  |\n                            | tipc_l2_rcv_msg()\n                            |   tipc_rcv()\n                            |     __tipc_node_link_up()\n                            |       tipc_link_build_state_msg()\n                            |         tipc_link_build_proto_msg()\n                            |           tipc_mon_prep()\n                            |           {\n                            |             ...\n                            |             // null-pointer dereference\n                            |             u16 gen = mon->dom_gen;\n                            |             ...\n                            |           }\n  // Not being executed yet |\n  tipc_mon_create()         |\n  {                         |\n    ...                     |\n    // allocate             |\n    mon = kzalloc();        |\n    ...                     |\n  }                         |\n\nMonitoring pointer in thread 2 is dereferenced before monitoring data\nis allocated in thread 1. This causes kernel panic.\n\nThis commit fixes it by allocating the monitoring data before enabling\nthe bearer to receive messages."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "35c55c9877f8",
                                            "version_value": "2de76d37d4a6"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.8",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "4.8",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.10.106",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.29",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.16.15",
                                                        "lessThanOrEqual": "5.16.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.17",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/2de76d37d4a6dca9b96ea51da24d4290e6cfa1a5",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/2de76d37d4a6dca9b96ea51da24d4290e6cfa1a5"
            },
            {
                "url": "https://git.kernel.org/stable/c/f96dc3adb9a97b8f3dfdb88796483491a3006b71",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/f96dc3adb9a97b8f3dfdb88796483491a3006b71"
            },
            {
                "url": "https://git.kernel.org/stable/c/f4f59fdbc748805b08c13dae14c01f0518c77c94",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/f4f59fdbc748805b08c13dae14c01f0518c77c94"
            },
            {
                "url": "https://git.kernel.org/stable/c/be4977b847f5d5cedb64d50eaaf2218c3a55a3a3",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/be4977b847f5d5cedb64d50eaaf2218c3a55a3a3"
            }
        ]
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    "generator": {
        "engine": "bippy-9e1c9544281a"
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}