{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "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."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/usb/typec/ucsi/ucsi.c",
                  "drivers/usb/typec/ucsi/ucsi.h"
               ],
               "versions": [
                  {
                     "version": "4dbc6a4ef06d",
                     "lessThan": "e5366bea0277",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4dbc6a4ef06d",
                     "lessThan": "a453bfd7ef15",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4dbc6a4ef06d",
                     "lessThan": "5e9c6f58b01e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4dbc6a4ef06d",
                     "lessThan": "1f4642b72be7",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/usb/typec/ucsi/ucsi.c",
                  "drivers/usb/typec/ucsi/ucsi.h"
               ],
               "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"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/e5366bea0277425e1868ba20eeb27c879d5a6e2d"
            },
            {
               "url": "https://git.kernel.org/stable/c/a453bfd7ef15fd9d524004d3ca7b05353a302911"
            },
            {
               "url": "https://git.kernel.org/stable/c/5e9c6f58b01e6fdfbc740390c01f542a35c97e57"
            },
            {
               "url": "https://git.kernel.org/stable/c/1f4642b72be79757f050924a9b9673b6a02034bc"
            }
         ],
         "title": "usb: typec: ucsi: Retrieve all the PDOs instead of just the first 4",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46980",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}