cve-2024-26884
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2024-12-19 08:49
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566acePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566acePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3ePatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
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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   Linux Linux Version: 3.19
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26884\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T11:15:10.163\",\"lastModified\":\"2024-11-21T09:03:17.677\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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 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\"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26884\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-30T19:28:25.440727Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-190\", \"description\": \"CWE-190 Integer Overflow or Wraparound\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T19:18:34.078Z\"}}], \"cna\": {\"title\": \"bpf: Fix hashtab overflow check on 32-bit arches\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"daaf427c6ab3\", \"lessThan\": 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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