CVE-2024-26884 (GCVE-0-2024-26884)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-08-05 11:28
VLAI
Title
bpf: Fix hashtab overflow check on 32-bit arches
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix hashtab overflow check on 32-bit arches The hashtab 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. So apply the same fix to hashtab, by moving the overflow check to before the roundup.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 33ec04cadb77605b71d9298311919303d390c4d5 (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 92c81fbb3ed2e0dfc33a4183a67135e1ab566ace (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 64f00b4df0597590b199b62a37a165473bf658a6 (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 3b08cfc65f07b1132c1979d73f014ae6e04de55d (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < a83fdaeaea3677b83a53f72ace2d73a19bcd6d93 (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 8435f0961bf3dc65e204094349bd9aeaac1f8868 (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < d817f0d34d927f2deb17dadbfe212c9a6a32ac3e (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < a6fa75b5096c0f9826a4fabe22d907b0a5bb1016 (git)
Affected: daaf427c6ab392bedcd018e326b2ffa1e1110cd6 , < 6787d916c2cf9850c97a0a3f73e08c43e7d973b1 (git)
Create a notification for this product.
Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (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.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix hashtab overflow check on 32-bit arches\\n\\nThe hashtab code relies on roundup_pow_of_two() to compute the number of\\nhash 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. So apply the same\\nfix to hashtab, by moving the overflow check to before the roundup.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: corrige la comprobaci\\u00f3n de desbordamiento de hashtab en arcos de 32 bits. El c\\u00f3digo hashtab se basa en roundup_pow_of_two() para calcular el n\\u00famero de dep\\u00f3sitos de hash y contiene una comprobaci\\u00f3n de desbordamiento comprobando 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. As\\u00ed que aplique la misma soluci\\u00f3n a hashtab, moviendo la verificaci\\u00f3n de desbordamiento antes del resumen.\"}]",
      "id": "CVE-2024-26884",
      "lastModified": "2024-11-21T09:03:17.677",
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      "published": "2024-04-17T11:15:10.163",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
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    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T02:56:28.000Z",
      "cve": "CVE-2024-26884",
      "id": "msrc_CVE-2024-26884",
      "initial_release_date": "2024-04-02T07:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf: Fix hashtab overflow check on 32-bit arches",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-26884.json",
      "version": "2"
    },
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      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26884.json",
      "version": "3"
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      "product_status:known_not_affected": "12",
      "product_status:recommended": "760",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26884",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26884.json",
      "version": "96"
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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. So apply the same\\nfix to hashtab, by moving the overflow check to before the roundup.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.311\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.273\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.214\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.153\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.83\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.23\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.11\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.2\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:09.509Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26884\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:09.509Z\", \"dateReserved\": \"2024-02-19T14:20:24.185Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:39.672Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.