{
   "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/writeback: fix possible divide-by-zero in wb_dirty_limits(), again\n\n(struct dirty_throttle_control *)->thresh is an unsigned long, but is\npassed as the u32 divisor argument to div_u64().  On architectures where\nunsigned long is 64 bytes, the argument will be implicitly truncated.\n\nUse div64_u64() instead of div_u64() so that the value used in the \"is\nthis a safe division\" check is the same as the divisor.\n\nAlso, remove redundant cast of the numerator to u64, as that should happen\nimplicitly.\n\nThis would be difficult to exploit in memcg domain, given the ratio-based\narithmetic domain_drity_limits() uses, but is much easier in global\nwriteback domain with a BDI_CAP_STRICTLIMIT-backing device, using e.g. \nvm.dirty_bytes=(1<<32)*PAGE_SIZE so that dtc->thresh == (1<<32)"
            }
         ],
         "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": "f6789593d5ce",
                     "lessThan": "c593d26fb5d5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "253f9ea7e8e5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "1f12e4b3284d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "23a28f5f3f6c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "81e7d2530d45",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "145faa3d0368",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "5099871b3703",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "2820005edae1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "16b1025eaa8f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "cbbe17a32443",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "ec18ec230301",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "f6620df12cb6",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "65977bed167a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "9319b647902c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f6789593d5ce",
                     "lessThan": "000099d71648",
                     "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": "3.16",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "3.16",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.307",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.318",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.269",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.280",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.210",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.222",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.149",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.163",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.79",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.98",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.18",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.39",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.6",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  },
                  {
                     "version": "6.9.9",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e"
            },
            {
               "url": "https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a"
            },
            {
               "url": "https://git.kernel.org/stable/c/1f12e4b3284d6c863f272eb2de0d4248ed211cf4"
            },
            {
               "url": "https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807"
            },
            {
               "url": "https://git.kernel.org/stable/c/81e7d2530d458548b90a5c5e76b77ad5e5d1c0df"
            },
            {
               "url": "https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c"
            },
            {
               "url": "https://git.kernel.org/stable/c/5099871b370335809c0fd1abad74d9c7c205d43f"
            },
            {
               "url": "https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59"
            },
            {
               "url": "https://git.kernel.org/stable/c/16b1025eaa8fc223ab4273ece20d1c3a4211a95d"
            },
            {
               "url": "https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00"
            },
            {
               "url": "https://git.kernel.org/stable/c/ec18ec230301583395576915d274b407743d8f6c"
            },
            {
               "url": "https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d"
            },
            {
               "url": "https://git.kernel.org/stable/c/65977bed167a92e87085e757fffa5798f7314c9f"
            },
            {
               "url": "https://git.kernel.org/stable/c/9319b647902cbd5cc884ac08a8a6d54ce111fc78"
            },
            {
               "url": "https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ec"
            }
         ],
         "title": "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-2024-26720",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}