CVE-2024-42131 (GCVE-0-2024-42131)

Vulnerability from cvelistv5 – Published: 2024-07-30 07:46 – Updated: 2026-05-11 20:27
VLAI?
Title
mm: avoid overflows in dirty throttling logic
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < 2b2d2b8766db028bd827af34075f221ae9e9efff (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < 4d3817b64eda07491bdd86a234629fe0764fb42a (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < 7a49389771ae7666f4dc3426e2a4594bf23ae290 (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < a25e8536184516b55ef89ab91dd2eea429de28d2 (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < c83ed422c24f0d4b264f89291d4fabe285f80dbc (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < bd16a7ee339aef3ee4c90cb23902afb6af379ea0 (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < 8e0b5e7f2895eccef5c2a0018b589266f90c4805 (git)
Affected: 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 , < 385d838df280eba6c8680f9777bfa0d0bfe7e8b2 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.222 , ≤ 5.10.* (semver)
Unaffected: 5.15.163 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.9 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "vulnStatus": "Modified",
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For dirty_ratio / dirty_background_ratio it isn\u0027t so\\nsimple as the dirty limit is computed from the amount of available memory\\nwhich can change due to memory hotplug etc.  So when converting dirty\\nlimits from ratios to numbers of pages, we just don\u0027t allow the result to\\nexceed UINT_MAX.\\n\\nThis is root-only triggerable problem which occurs when the operator\\nsets dirty limits to \u003e16 TB.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: evitar desbordamientos en la l\u00f3gica de limitaci\u00f3n sucia La l\u00f3gica de limitaci\u00f3n sucia se entremezcla con suposiciones de que los l\u00edmites sucios en unidades PAGE_SIZE caben en 32 bits (de modo que varias multiplicaciones caben en 64 bits) . 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      "cveMetadata": "{\"cveId\": \"CVE-2024-42131\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:51:57.843Z\", \"dateReserved\": \"2024-07-29T15:50:41.186Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:46:26.872Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.