cve-2024-26883
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2024-12-19 08:49
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46aePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042dPatch
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: 5.11
Show details on NVD website

To clipboard 

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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. Verificar el valor antes de redondear no tiene este problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-119\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.19.311\",\"matchCriteriaId\":\"A6E19FC1-2A3F-4FF8-805C-2864C71553EC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.273\",\"matchCriteriaId\":\"620FD8B7-BF03-43E0-951A-0A58461D4C55\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.214\",\"matchCriteriaId\":\"65987874-467B-4D3B-91D6-68A129B34FB8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.153\",\"matchCriteriaId\":\"ACB69438-845D-4E3C-B114-3140611F9C0B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.83\",\"matchCriteriaId\":\"121A07F6-F505-4C47-86BF-9BB6CC7B6C19\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.23\",\"matchCriteriaId\":\"E00814DC-0BA7-431A-9926-80FEB4A96C68\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.11\",\"matchCriteriaId\":\"9B95D3A6-E162-47D5-ABFC-F3FA74FA7CFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.8\",\"versionEndExcluding\":\"6.8.2\",\"matchCriteriaId\":\"543A75FF-25B8-4046-A514-1EA8EDD87AB1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patc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  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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