cve/published/2021/CVE-2021-46937.json

{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'\n\nDAMON debugfs interface increases the reference counts of 'struct pid's\nfor targets from the 'target_ids' file write callback\n('dbgfs_target_ids_write()'), but decreases the counts only in DAMON\nmonitoring termination callback ('dbgfs_before_terminate()').\n\nTherefore, when 'target_ids' file is repeatedly written without DAMON\nmonitoring start/termination, the reference count is not decreased and\ntherefore memory for the 'struct pid' cannot be freed.  This commit\nfixes this issue by decreasing the reference counts when 'target_ids' is\nwritten."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/damon/dbgfs.c"
               ],
               "versions": [
                  {
                     "version": "4bc05954d0076655cfaf6f0135585bdc20cd6b11",
                     "lessThan": "ffe4a1ba1a82c416a6b3a09d46594f6a885ae141",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4bc05954d0076655cfaf6f0135585bdc20cd6b11",
                     "lessThan": "ebb3f994dd92f8fb4d70c7541091216c1e10cb71",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/damon/dbgfs.c"
               ],
               "versions": [
                  {
                     "version": "5.15",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.15",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "5.15.13",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "5.16",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "cpeApplicability": [
            {
               "nodes": [
                  {
                     "operator": "OR",
                     "negate": false,
                     "cpeMatch": [
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.15",
                           "versionEndExcluding": "5.15.13"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.15",
                           "versionEndExcluding": "5.16"
                        }
                     ]
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141"
            },
            {
               "url": "https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71"
            }
         ],
         "title": "mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'",
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            "engine": "bippy-1.2.0"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46937",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}