CVE-2024-26766

{
  "id": "CVE-2024-26766",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-26766",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-04-03T18:11:09.801717Z"
        }
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          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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        "source": "nvd@nist.gov",
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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  "published": "2024-04-03T17:15:52.683",
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/hfi1: Fix sdma.h tx->num_descs off-by-one error\n\nUnfortunately the commit `fd8958efe877` introduced another error\ncausing the `descs` array to overflow. This reults in further crashes\neasily reproducible by `sendmsg` system call.\n\n[ 1080.836473] general protection fault, probably for non-canonical address 0x400300015528b00a: 0000 [#1] PREEMPT SMP PTI\n[ 1080.869326] RIP: 0010:hfi1_ipoib_build_ib_tx_headers.constprop.0+0xe1/0x2b0 [hfi1]\n--\n[ 1080.974535] Call Trace:\n[ 1080.976990]  <TASK>\n[ 1081.021929]  hfi1_ipoib_send_dma_common+0x7a/0x2e0 [hfi1]\n[ 1081.027364]  hfi1_ipoib_send_dma_list+0x62/0x270 [hfi1]\n[ 1081.032633]  hfi1_ipoib_send+0x112/0x300 [hfi1]\n[ 1081.042001]  ipoib_start_xmit+0x2a9/0x2d0 [ib_ipoib]\n[ 1081.046978]  dev_hard_start_xmit+0xc4/0x210\n--\n[ 1081.148347]  __sys_sendmsg+0x59/0xa0\n\ncrash> ipoib_txreq 0xffff9cfeba229f00\nstruct ipoib_txreq {\n  txreq = {\n    list = {\n      next = 0xffff9cfeba229f00,\n      prev = 0xffff9cfeba229f00\n    },\n    descp = 0xffff9cfeba229f40,\n    coalesce_buf = 0x0,\n    wait = 0xffff9cfea4e69a48,\n    complete = 0xffffffffc0fe0760 <hfi1_ipoib_sdma_complete>,\n    packet_len = 0x46d,\n    tlen = 0x0,\n    num_desc = 0x0,\n    desc_limit = 0x6,\n    next_descq_idx = 0x45c,\n    coalesce_idx = 0x0,\n    flags = 0x0,\n    descs = {{\n        qw = {0x8024000120dffb00, 0x4}  # SDMA_DESC0_FIRST_DESC_FLAG (bit 63)\n      }, {\n        qw = {  0x3800014231b108, 0x4}\n      }, {\n        qw = { 0x310000e4ee0fcf0, 0x8}\n      }, {\n        qw = {  0x3000012e9f8000, 0x8}\n      }, {\n        qw = {  0x59000dfb9d0000, 0x8}\n      }, {\n        qw = {  0x78000e02e40000, 0x8}\n      }}\n  },\n  sdma_hdr =  0x400300015528b000,  <<< invalid pointer in the tx request structure\n  sdma_status = 0x0,                   SDMA_DESC0_LAST_DESC_FLAG (bit 62)\n  complete = 0x0,\n  priv = 0x0,\n  txq = 0xffff9cfea4e69880,\n  skb = 0xffff9d099809f400\n}\n\nIf an SDMA send consists of exactly 6 descriptors and requires dword\npadding (in the 7th descriptor), the sdma_txreq descriptor array is not\nproperly expanded and the packet will overflow into the container\nstructure. This results in a panic when the send completion runs. The\nexact panic varies depending on what elements of the container structure\nget corrupted. The fix is to use the correct expression in\n_pad_sdma_tx_descs() to test the need to expand the descriptor array.\n\nWith this patch the crashes are no longer reproducible and the machine is\nstable."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: IB/hfi1: Corrija el error sdma.h tx-&gt;num_descs off-by-one Desafortunadamente, el commit `fd8958efe877` introdujo otro error que provocó que la matriz `descs` se desbordara. Esto da como resultado más fallas fácilmente reproducibles mediante la llamada al SYSTEM \"sendmsg\". [ 1080.836473] falla de protección general, probablemente para dirección no canónica 0x400300015528b00a: 0000 [#1] PREEMPT SMP PTI [ 1080.869326] RIP: 0010:hfi1_ipoib_build_ib_tx_headers.constprop.0+0xe1/0x2b0 [hfi1] -- [1080.974535] Seguimiento de llamadas: [ 1080.976990]  [ 1081.021929] hfi1_ipoib_send_dma_common+0x7a/0x2e0 [hfi1] [ 1081.027364] hfi1_ipoib_send_dma_list+0x62/0x270 [hfi1] [ 1081.032633] h fi1_ipoib_send+0x112/0x300 [hfi1] [ 1081.042001] ipoib_start_xmit+0x2a9/0x2d0 [ib_ipoib] [ 1081.046978] dev_hard_start_xmit+0xc4/0x210 -- [ 1081.148347] __sys_sendmsg+0x59/0xa0 crash&gt; ipoib_txreq 0xffff9cfeba229f00 struct ipoib_txreq { txreq = { list = { next = 0xffff9cfe ba229f00, anterior = 0xffff9cfeba229f00}, descp = 0xffff9cfeba229f40, coalesce_buf = 0x0, espera = 0xffff9cfea4e69a48, completo = 0xffffffffc0fe0760 , paquete_len = 0x46d, tlen = 0x0, num_desc = 0x0, desc_limit = 0x6, next_descq_idx = 0x45c, coalesce_idx = 0x0, banderas = 0x0 , descs = {{ qw = {0x8024000120dffb00, 0x4} # SDMA_DESC0_FIRST_DESC_FLAG (bit 63) }, { qw = { 0x3800014231b108, 0x4} }, { qw = { 0x310000e4ee0fcf0, 0x8} }, { qw = { 0x3000012e9f8000, 0x8} }, { qw = { 0x59000dfb9d0000, 0x8} }, { qw = { 0x78000e02e40000, 0x8} }} }, sdma_hdr = 0x400300015528b000, &lt;&lt;&lt; puntero no válido en la estructura de solicitud de tx sdma_status = 0x0, SDMA_DESC0_LAST_DESC_FLAG (bit 62) completo = 0x0, priv = 0x0, txq = 0xffff9cfea4e69880, skb = 0xffff9d099809f400 } Si es un SDMA send consta de exactamente 6 descriptores y requiere relleno de dword (en el séptimo descriptor), la matriz de descriptores sdma_txreq no se expande adecuadamente y el paquete se desbordará hacia la estructura del contenedor. Esto produce pánico cuando se ejecuta la finalización del envío. El pánico exacto varía dependiendo de qué elementos de la estructura del contenedor se corrompen. La solución es utilizar la expresión correcta en _pad_sdma_tx_descs() para probar la necesidad de expandir la matriz de descriptores. Con este parche los fallos ya no son reproducibles y la máquina está estable."
    }
  ],
  "lastModified": "2026-08-04T11:17:02.050",
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        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}