CVE-2024-26884 (GCVE-0-2024-26884)
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2025-05-04 08:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
Version: daaf427c6ab392bedcd018e326b2ffa1e1110cd6
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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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:17:34.853Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26884\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:17:34.853Z\", \"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": "5.1"
    }
  }
}


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