{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-46980",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: Retrieve all the PDOs instead of just the first 4\n\ncommit 4dbc6a4ef06d (\"usb: typec: ucsi: save power data objects\nin PD mode\") introduced retrieval of the PDOs when connected to a\nPD-capable source. But only the first 4 PDOs are received since\nthat is the maximum number that can be fetched at a time given the\nMESSAGE_IN length limitation (16 bytes). However, as per the PD spec\na connected source may advertise up to a maximum of 7 PDOs.\n\nIf such a source is connected it's possible the PPM could have\nnegotiated a power contract with one of the PDOs at index greater\nthan 4, and would be reflected in the request data object's (RDO)\nobject position field. This would result in an out-of-bounds access\nwhen the rdo_index() is used to index into the src_pdos array in\nucsi_psy_get_voltage_now().\n\nWith the help of the UBSAN -fsanitize=array-bounds checker enabled\nthis exact issue is revealed when connecting to a PD source adapter\nthat advertise 5 PDOs and the PPM enters a contract having selected\nthe 5th one.\n\n[  151.545106][   T70] Unexpected kernel BRK exception at EL1\n[  151.545112][   T70] Internal error: BRK handler: f2005512 [#1] PREEMPT SMP\n...\n[  151.545499][   T70] pc : ucsi_psy_get_prop+0x208/0x20c\n[  151.545507][   T70] lr : power_supply_show_property+0xc0/0x328\n...\n[  151.545542][   T70] Call trace:\n[  151.545544][   T70]  ucsi_psy_get_prop+0x208/0x20c\n[  151.545546][   T70]  power_supply_uevent+0x1a4/0x2f0\n[  151.545550][   T70]  dev_uevent+0x200/0x384\n[  151.545555][   T70]  kobject_uevent_env+0x1d4/0x7e8\n[  151.545557][   T70]  power_supply_changed_work+0x174/0x31c\n[  151.545562][   T70]  process_one_work+0x244/0x6f0\n[  151.545564][   T70]  worker_thread+0x3e0/0xa64\n\nWe can resolve this by instead retrieving and storing up to the\nmaximum of 7 PDOs in the con->src_pdos array. This would involve\ntwo calls to the GET_PDOS command."
            }
        ]
    },
    "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": "4dbc6a4ef06d",
                                            "version_value": "e5366bea0277"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.8",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.8",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.38",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.11.22",
                                                        "lessThanOrEqual": "5.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.12.5",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.13",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/e5366bea0277425e1868ba20eeb27c879d5a6e2d",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/e5366bea0277425e1868ba20eeb27c879d5a6e2d"
            },
            {
                "url": "https://git.kernel.org/stable/c/a453bfd7ef15fd9d524004d3ca7b05353a302911",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/a453bfd7ef15fd9d524004d3ca7b05353a302911"
            },
            {
                "url": "https://git.kernel.org/stable/c/5e9c6f58b01e6fdfbc740390c01f542a35c97e57",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/5e9c6f58b01e6fdfbc740390c01f542a35c97e57"
            },
            {
                "url": "https://git.kernel.org/stable/c/1f4642b72be79757f050924a9b9673b6a02034bc",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/1f4642b72be79757f050924a9b9673b6a02034bc"
            }
        ]
    },
    "generator": {
        "engine": "bippy-a5840b7849dd"
    }
}