{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again\"\n\nPatch series \"mm: Avoid possible overflows in dirty throttling\".\n\nDirty throttling logic assumes dirty limits in page units fit into\n32-bits.  This patch series makes sure this is true (see patch 2/2 for\nmore details).\n\n\nThis patch (of 2):\n\nThis reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78.\n\nThe commit is broken in several ways.  Firstly, the removed (u64) cast\nfrom the multiplication will introduce a multiplication overflow on 32-bit\narchs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the\ndefault settings with 4GB of RAM will trigger this).  Secondly, the\ndiv64_u64() is unnecessarily expensive on 32-bit archs.  We have\ndiv64_ul() in case we want to be safe & cheap.  Thirdly, if dirty\nthresholds are larger than 1<<32 pages, then dirty balancing is going to\nblow up in many other spectacular ways anyway so trying to fix one\npossible overflow is just moot."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/page-writeback.c"
               ],
               "versions": [
                  {
                     "version": "c593d26fb5d5",
                     "lessThan": "253f9ea7e8e5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1f12e4b3284d",
                     "lessThan": "23a28f5f3f6c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "81e7d2530d45",
                     "lessThan": "145faa3d0368",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5099871b3703",
                     "lessThan": "2820005edae1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "16b1025eaa8f",
                     "lessThan": "cbbe17a32443",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "ec18ec230301",
                     "lessThan": "f6620df12cb6",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "9319b647902c",
                     "lessThan": "000099d71648",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "9319b647902c",
                     "lessThan": "30139c702048",
                     "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/page-writeback.c"
               ],
               "versions": [
                  {
                     "version": "6.8",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.8",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.318",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.280",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.222",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.163",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.98",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.39",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9.9",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a"
            },
            {
               "url": "https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807"
            },
            {
               "url": "https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c"
            },
            {
               "url": "https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59"
            },
            {
               "url": "https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00"
            },
            {
               "url": "https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d"
            },
            {
               "url": "https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ec"
            },
            {
               "url": "https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63"
            }
         ],
         "title": "Revert \"mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again\"",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-42102",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}