{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix async_free_space accounting for empty parcels\n\nIn 4.13, commit 74310e06be4d (\"android: binder: Move buffer out of area shared with user space\")\nfixed a kernel structure visibility issue. As part of that patch,\nsizeof(void *) was used as the buffer size for 0-length data payloads so\nthe driver could detect abusive clients sending 0-length asynchronous\ntransactions to a server by enforcing limits on async_free_size.\n\nUnfortunately, on the \"free\" side, the accounting of async_free_space\ndid not add the sizeof(void *) back. The result was that up to 8-bytes of\nasync_free_space were leaked on every async transaction of 8-bytes or\nless.  These small transactions are uncommon, so this accounting issue\nhas gone undetected for several years.\n\nThe fix is to use \"buffer_size\" (the allocated buffer size) instead of\n\"size\" (the logical buffer size) when updating the async_free_space\nduring the free operation. These are the same except for this\ncorner case of asynchronous transactions with payloads < 8 bytes."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/android/binder_alloc.c"
               ],
               "versions": [
                  {
                     "version": "74310e06be4d",
                     "lessThan": "2d2df539d052",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "74310e06be4d",
                     "lessThan": "7c7064402609",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "74310e06be4d",
                     "lessThan": "103b16a8c51f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "74310e06be4d",
                     "lessThan": "1cb8444f3114",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "74310e06be4d",
                     "lessThan": "17691bada6b2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "74310e06be4d",
                     "lessThan": "cfd0d84ba28c",
                     "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/android/binder_alloc.c"
               ],
               "versions": [
                  {
                     "version": "4.14",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.14",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.261",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.224",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.170",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.90",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.13",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/2d2df539d05205fd83c404d5f2dff48d36f9b495"
            },
            {
               "url": "https://git.kernel.org/stable/c/7c7064402609aeb6fb11be1b4ec10673ff17b593"
            },
            {
               "url": "https://git.kernel.org/stable/c/103b16a8c51f96d5fe063022869ea906c256e5da"
            },
            {
               "url": "https://git.kernel.org/stable/c/1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4"
            },
            {
               "url": "https://git.kernel.org/stable/c/17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff"
            },
            {
               "url": "https://git.kernel.org/stable/c/cfd0d84ba28c18b531648c9d4a35ecca89ad9901"
            }
         ],
         "title": "binder: fix async_free_space accounting for empty parcels",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46935",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}