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

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-05-12 11:50
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
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.
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\"6.6.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/hashtab.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5\"}, {\"url\": \"https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace\"}, {\"url\": \"https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6\"}, {\"url\": \"https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d\"}, {\"url\": \"https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93\"}, {\"url\": \"https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868\"}, {\"url\": \"https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e\"}, {\"url\": \"https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016\"}, {\"url\": \"https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"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.\"}], \"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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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.