{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47102",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: marvell: prestera: fix incorrect structure access\n\nIn line:\n\tupper = info->upper_dev;\nWe access upper_dev field, which is related only for particular events\n(e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memory\naccess for another events,\nwhen ptr is not netdev_notifier_changeupper_info.\n\nThe KASAN logs are as follows:\n\n[   30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[   30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778\n[   30.139866]\n[   30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6\n[   30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[   30.153056] Call trace:\n[   30.155547]  dump_backtrace+0x0/0x2c0\n[   30.159320]  show_stack+0x18/0x30\n[   30.162729]  dump_stack_lvl+0x68/0x84\n[   30.166491]  print_address_description.constprop.0+0x74/0x2b8\n[   30.172346]  kasan_report+0x1e8/0x250\n[   30.176102]  __asan_load8+0x98/0xe0\n[   30.179682]  prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[   30.186847]  prestera_netdev_event_handler+0x1b4/0x1c0 [prestera]\n[   30.193313]  raw_notifier_call_chain+0x74/0xa0\n[   30.197860]  call_netdevice_notifiers_info+0x68/0xc0\n[   30.202924]  register_netdevice+0x3cc/0x760\n[   30.207190]  register_netdev+0x24/0x50\n[   30.211015]  prestera_device_register+0x8a0/0xba0 [prestera]"
            }
        ]
    },
    "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": "3d5048cc54bd",
                                            "version_value": "5c553a0cd126"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.14",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.14",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.12",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.16",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0"
            },
            {
                "url": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb"
            }
        ]
    },
    "generator": {
        "engine": "bippy-4986f5686161"
    }
}