fkie_cve-2024-40970
Vulnerability from fkie_nvd
Published
2024-07-12 13:15
Modified
2024-11-21 09:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Avoid hw_desc array overrun in dw-axi-dmac I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun). To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly. Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
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                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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               negate: false,
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   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nAvoid hw_desc array overrun in dw-axi-dmac\n\nI have a use case where nr_buffers = 3 and in which each descriptor is composed by 3\nsegments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put()\nhandles the hw_desc considering the descs_allocated, this scenario would result in a\nkernel panic (hw_desc array will be overrun).\n\nTo fix this, the proposal is to add a new member to the axi_dma_desc structure,\nwhere we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in\naxi_desc_put() to handle the hw_desc array correctly.\n\nAdditionally I propose to remove the axi_chan_start_first_queued() call after completing\nthe transfer, since it was identified that unbalance can occur (started descriptors can\nbe interrupted and transfer ignored due to DMA channel not being enabled).",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Evitar la saturación de la matriz hw_desc en dw-axi-dmac. Tengo un caso de uso donde nr_buffers = 3 y en el que cada descriptor está compuesto por 3 segmentos, lo que da como resultado que el canal DMA descs_allocated sea 9. Dado que axi_desc_put() maneja hw_desc considerando descs_allocated, este escenario provocaría un pánico en el kernel (la matriz hw_desc se desbordará). Para solucionar este problema, la propuesta es agregar un nuevo miembro a la estructura axi_dma_desc, donde mantenemos el número de hw_descs asignados (axi_desc_alloc()) y lo usamos en axi_desc_put() para manejar la matriz hw_desc correctamente. Además, propongo eliminar la llamada axi_chan_start_first_queued() después de completar la transferencia, ya que se identificó que puede ocurrir un desequilibrio (los descriptores iniciados pueden interrumpirse y la transferencia se ignora debido a que el canal DMA no está habilitado).",
      },
   ],
   id: "CVE-2024-40970",
   lastModified: "2024-11-21T09:31:58.550",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-07-12T13:15:18.687",
   references: [
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Modified",
   weaknesses: [
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         description: [
            {
               lang: "en",
               value: "NVD-CWE-noinfo",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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