CVE-2024-42102 (GCVE-0-2024-42102)
Vulnerability from cvelistv5
Published
2024-07-30 07:45
Modified
2025-11-03 22:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.
References
Impacted products
Vendor Product Version
Linux Linux Version: c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e
Version: 1f12e4b3284d6c863f272eb2de0d4248ed211cf4
Version: 81e7d2530d458548b90a5c5e76b77ad5e5d1c0df
Version: 5099871b370335809c0fd1abad74d9c7c205d43f
Version: 16b1025eaa8fc223ab4273ece20d1c3a4211a95d
Version: ec18ec230301583395576915d274b407743d8f6c
Version: 9319b647902cbd5cc884ac08a8a6d54ce111fc78
Version: 9319b647902cbd5cc884ac08a8a6d54ce111fc78
Version: 65977bed167a92e87085e757fffa5798f7314c9f
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overflows in dirty throttling\\\".\\n\\nDirty throttling logic assumes dirty limits in page units fit into\\n32-bits.  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Thirdly, if dirty\\nthresholds are larger than 1\u003c\u003c32 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.318\", \"versionStartIncluding\": \"4.19.307\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.280\", \"versionStartIncluding\": \"5.4.269\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.222\", \"versionStartIncluding\": \"5.10.210\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.163\", \"versionStartIncluding\": \"5.15.149\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.98\", \"versionStartIncluding\": \"6.1.79\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.39\", \"versionStartIncluding\": \"6.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.9\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.7.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:57:37.713Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42102\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:57:37.713Z\", \"dateReserved\": \"2024-07-29T15:50:41.174Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:45:58.423Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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