CVE-2024-26883 (GCVE-0-2024-26883)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-05-12 11:50
VLAI?
Title
bpf: Fix stackmap overflow check on 32-bit arches
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 063c722dd9d285d877e6fd499e753d6224f4c046 , < d0e214acc59145ce25113f617311aa79dda39cb3 (git)
Affected: 7e3a6b820535eb395784060ae26c5af579528fa0 , < 21e5fa4688e1a4d3db6b72216231b24232f75c1d (git)
Affected: 8032bf2af9ce26b3a362b9711d15f626ab946a74 , < 15641007df0f0d35fa28742b25c2a7db9dcd6895 (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < ca1f06e72dec41ae4f76e7b1a8a97265447b46ae (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < f06899582ccee09bd85d0696290e3eaca9aa042d (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < 7070b274c7866a4c5036f8d54fcaf315c64ac33a (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < 43f798b9036491fb014b55dd61c4c5c3193267d0 (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < 0971126c8164abe2004b8536b49690a0d6005b0a (git)
Affected: 6183f4d3a0a2ad230511987c6c362ca43ec0055f , < 7a4b21250bf79eef26543d35bd390448646c536b (git)
Affected: 253150830a012adfccf90afcebae8fda5b05a80f (git)
Affected: 766107351731ae223ebf60ca22bdfeb47ce6acc8 (git)
Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 4.19.311 , ≤ 4.19.* (semver)
Unaffected: 5.4.273 , ≤ 5.4.* (semver)
Unaffected: 5.10.214 , ≤ 5.10.* (semver)
Unaffected: 5.15.153 , ≤ 5.15.* (semver)
Unaffected: 6.1.83 , ≤ 6.1.* (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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This was triggered by syzbot on the DEVMAP_HASH type, which\\ncontains the same check, copied from the hashtab code.\\n\\nThe commit in the fixes tag actually attempted to fix this, but the fix\\ndid not account for the UB, so the fix only works on CPUs where an\\noverflow does result in a neat truncation to zero, which is not\\nguaranteed. Checking the value before rounding does not have this\\nproblem.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige la verificaci\u00f3n de desbordamiento del mapa de pila en arcos de 32 bits. El c\u00f3digo del mapa de pila se basa en roundup_pow_of_two() para calcular el n\u00famero de dep\u00f3sitos de hash y contiene una verificaci\u00f3n de desbordamiento verificando si el valor resultante es 0. Sin embargo, en arcos de 32 bits, el c\u00f3digo de resumen en s\u00ed puede desbordarse al realizar un desplazamiento hacia la izquierda de 32 bits de un valor largo sin signo, lo cual es un comportamiento indefinido, por lo que no se garantiza que se trunque claramente. Esto fue activado por syzbot en el tipo DEVMAP_HASH, que contiene la misma verificaci\u00f3n, copiada del c\u00f3digo hashtab. La confirmaci\u00f3n en la etiqueta de correcciones en realidad intent\u00f3 solucionar este problema, pero la correcci\u00f3n no tuvo en cuenta la UB, por lo que la correcci\u00f3n solo funciona en CPU donde un desbordamiento resulta en un truncamiento claro a cero, lo cual no est\u00e1 garantizado. 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check on 32-bit arches\\n\\nThe stackmap code relies on roundup_pow_of_two() to compute the number\\nof hash buckets, and contains an overflow check by checking if the\\nresulting value is 0. However, on 32-bit arches, the roundup code itself\\ncan overflow by doing a 32-bit left-shift of an unsigned long value,\\nwhich is undefined behaviour, so it is not guaranteed to truncate\\nneatly. This was triggered by syzbot on the DEVMAP_HASH type, which\\ncontains the same check, copied from the hashtab code.\\n\\nThe commit in the fixes tag actually attempted to fix this, but the fix\\ndid not account for the UB, so the fix only works on CPUs where an\\noverflow does result in a neat truncation to zero, which is not\\nguaranteed. Checking the value before rounding does not have this\\nproblem.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:17:33.738Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26883\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:17:33.738Z\", \"dateReserved\": \"2024-02-19T14:20:24.185Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:39.036Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.




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.