{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/balloon: use a kernel thread instead a workqueue\n\nToday the Xen ballooning is done via delayed work in a workqueue. This\nmight result in workqueue hangups being reported in case of large\namounts of memory are being ballooned in one go (here 16GB):\n\nBUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s!\nShowing busy workqueues and worker pools:\nworkqueue events: flags=0x0\n  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3\n    in-flight: 229:balloon_process\n    pending: cache_reap\nworkqueue events_freezable_power_: flags=0x84\n  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2\n    pending: disk_events_workfn\nworkqueue mm_percpu_wq: flags=0x8\n  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2\n    pending: vmstat_update\npool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43\n\nThis can easily be avoided by using a dedicated kernel thread for doing\nthe ballooning work."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "versions": [
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "c5d5a43dd2b6",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "6bba79c6a073",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "29917bbb07c3",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "372d3e6ea1e1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "922fd5b6bb13",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1da177e4c3f4",
                     "lessThan": "8480ed9c2bbd",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "versions": [
                  {
                     "version": "4.14.249",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.209",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.150",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.70",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.14.9",
                     "lessThanOrEqual": "5.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/c5d5a43dd2b649a0a290bfed00fb76d1aff89be6"
            },
            {
               "url": "https://git.kernel.org/stable/c/6bba79c6a073741b672b0bf86a1f03c0fe47f973"
            },
            {
               "url": "https://git.kernel.org/stable/c/29917bbb07c30be295dece245c7c21872e1a6fbb"
            },
            {
               "url": "https://git.kernel.org/stable/c/372d3e6ea1e115942fdfb4b25f7003d822d071be"
            },
            {
               "url": "https://git.kernel.org/stable/c/922fd5b6bb13ad31ff36e86e2eba2f26d8135272"
            },
            {
               "url": "https://git.kernel.org/stable/c/8480ed9c2bbd56fc86524998e5f2e3e22f5038f6"
            }
         ],
         "title": "xen/balloon: use a kernel thread instead a workqueue",
         "x_generator": {
            "engine": "bippy-d175d3acf727"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47377",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}