{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: Decrease sock refcount when sock timers expire\n\nCommit 63346650c1a9 (\"netrom: switch to sock timer API\") switched to use\nsock timer API. It replaces mod_timer() by sk_reset_timer(), and\ndel_timer() by sk_stop_timer().\n\nFunction sk_reset_timer() will increase the refcount of sock if it is\ncalled on an inactive timer, hence, in case the timer expires, we need to\ndecrease the refcount ourselves in the handler, otherwise, the sock\nrefcount will be unbalanced and the sock will never be freed."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/netrom/nr_timer.c"
               ],
               "versions": [
                  {
                     "version": "ce29e8a259de",
                     "lessThan": "853262355518",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "baa9e32336bf",
                     "lessThan": "a01634bf91f2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "0adf571fa34b",
                     "lessThan": "48866fd5c361",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "2c6b572458a9",
                     "lessThan": "9619cc7d97c3",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "63346650c1a9",
                     "lessThan": "25df44e90ff5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "63346650c1a9",
                     "lessThan": "6811744bd0ef",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "63346650c1a9",
                     "lessThan": "bc1660206c37",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "63346650c1a9",
                     "lessThan": "517a16b1a88b",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/netrom/nr_timer.c"
               ],
               "versions": [
                  {
                     "version": "5.0",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.0",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.4.277",
                     "lessThanOrEqual": "4.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.277",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.241",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.199",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.136",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.54",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.13.6",
                     "lessThanOrEqual": "5.13.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.14",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29"
            },
            {
               "url": "https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cf"
            },
            {
               "url": "https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef"
            },
            {
               "url": "https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950"
            },
            {
               "url": "https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3"
            },
            {
               "url": "https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8a"
            },
            {
               "url": "https://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250"
            },
            {
               "url": "https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8"
            }
         ],
         "title": "netrom: Decrease sock refcount when sock timers expire",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47294",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}