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CVE-2024-50177

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: fix a UBSAN warning in DML2.1

When programming phantom pipe, since cursor_width is explicity set to 0, this causes calculation logic to trigger overflow for an unsigned int triggering the kernel's UBSAN check as below:

Fix this by adding a guard for checking cursor width before triggering the size calculation.

Detalles técnicos trazas, registros y código del informe original
[   40.962845] UBSAN: shift-out-of-bounds in /tmp/amd.EfpumTkO/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c:3312:34
[   40.962849] shift exponent 4294967170 is too large for 32-bit type 'unsigned int'
[   40.962852] CPU: 1 PID: 1670 Comm: gnome-shell Tainted: G        W  OE      6.5.0-41-generic #41~22.04.2-Ubuntu
[   40.962854] Hardware name: Gigabyte Technology Co., Ltd. X670E AORUS PRO X/X670E AORUS PRO X, BIOS F21 01/10/2024
[   40.962856] Call Trace:
[   40.962857]  <TASK>
[   40.962860]  dump_stack_lvl+0x48/0x70
[   40.962870]  dump_stack+0x10/0x20
[   40.962872]  __ubsan_handle_shift_out_of_bounds+0x1ac/0x360
[   40.962878]  calculate_cursor_req_attributes.cold+0x1b/0x28 [amdgpu]
[   40.963099]  dml_core_mode_support+0x6b91/0x16bc0 [amdgpu]
[   40.963327]  ? srso_alias_return_thunk+0x5/0x7f
[   40.963331]  ? CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport+0x18b8/0x2790 [amdgpu]
[   40.963534]  ? srso_alias_return_thunk+0x5/0x7f
[   40.963536]  ? dml_core_mode_support+0xb3db/0x16bc0 [amdgpu]
[   40.963730]  dml2_core_calcs_mode_support_ex+0x2c/0x90 [amdgpu]
[   40.963906]  ? srso_alias_return_thunk+0x5/0x7f
[   40.963909]  ? dml2_core_calcs_mode_support_ex+0x2c/0x90 [amdgpu]
[   40.964078]  core_dcn4_mode_support+0x72/0xbf0 [amdgpu]
[   40.964247]  dml2_top_optimization_perform_optimization_phase+0x1d3/0x2a0 [amdgpu]
[   40.964420]  dml2_build_mode_programming+0x23d/0x750 [amdgpu]
[   40.964587]  dml21_validate+0x274/0x770 [amdgpu]
[   40.964761]  ? srso_alias_return_thunk+0x5/0x7f
[   40.964763]  ? resource_append_dpp_pipes_for_plane_composition+0x27c/0x3b0 [amdgpu]
[   40.964942]  dml2_validate+0x504/0x750 [amdgpu]
[   40.965117]  ? dml21_copy+0x95/0xb0 [amdgpu]
[   40.965291]  ? srso_alias_return_thunk+0x5/0x7f
[   40.965295]  dcn401_validate_bandwidth+0x4e/0x70 [amdgpu]
[   40.965491]  update_planes_and_stream_state+0x38d/0x5c0 [amdgpu]
[   40.965672]  update_planes_and_stream_v3+0x52/0x1e0 [amdgpu]
[   40.965845]  ? srso_alias_return_thunk+0x5/0x7f
[   40.965849]  dc_update_planes_and_stream+0x71/0xb0 [amdgpu]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-50177",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-50177",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-10-01T20:19:12.163873Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "70839da6360500a82e4d5f78499284474cbed7c1",
              "lessThan": "27bc3da5eae57e3af8f5648b4498ffde48781434",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "70839da6360500a82e4d5f78499284474cbed7c1",
              "lessThan": "eaf3adb8faab611ba57594fa915893fc93a7788c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.11.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.11.*"
            },
            {
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-11-08T06:15:15.117",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/27bc3da5eae57e3af8f5648b4498ffde48781434",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/eaf3adb8faab611ba57594fa915893fc93a7788c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: fix a UBSAN warning in DML2.1\n\nWhen programming phantom pipe, since cursor_width is explicity set to 0,\nthis causes calculation logic to trigger overflow for an unsigned int\ntriggering the kernel's UBSAN check as below:\n\n[   40.962845] UBSAN: shift-out-of-bounds in /tmp/amd.EfpumTkO/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c:3312:34\n[   40.962849] shift exponent 4294967170 is too large for 32-bit type 'unsigned int'\n[   40.962852] CPU: 1 PID: 1670 Comm: gnome-shell Tainted: G        W  OE      6.5.0-41-generic #41~22.04.2-Ubuntu\n[   40.962854] Hardware name: Gigabyte Technology Co., Ltd. X670E AORUS PRO X/X670E AORUS PRO X, BIOS F21 01/10/2024\n[   40.962856] Call Trace:\n[   40.962857]  <TASK>\n[   40.962860]  dump_stack_lvl+0x48/0x70\n[   40.962870]  dump_stack+0x10/0x20\n[   40.962872]  __ubsan_handle_shift_out_of_bounds+0x1ac/0x360\n[   40.962878]  calculate_cursor_req_attributes.cold+0x1b/0x28 [amdgpu]\n[   40.963099]  dml_core_mode_support+0x6b91/0x16bc0 [amdgpu]\n[   40.963327]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.963331]  ? CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport+0x18b8/0x2790 [amdgpu]\n[   40.963534]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.963536]  ? dml_core_mode_support+0xb3db/0x16bc0 [amdgpu]\n[   40.963730]  dml2_core_calcs_mode_support_ex+0x2c/0x90 [amdgpu]\n[   40.963906]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.963909]  ? dml2_core_calcs_mode_support_ex+0x2c/0x90 [amdgpu]\n[   40.964078]  core_dcn4_mode_support+0x72/0xbf0 [amdgpu]\n[   40.964247]  dml2_top_optimization_perform_optimization_phase+0x1d3/0x2a0 [amdgpu]\n[   40.964420]  dml2_build_mode_programming+0x23d/0x750 [amdgpu]\n[   40.964587]  dml21_validate+0x274/0x770 [amdgpu]\n[   40.964761]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.964763]  ? resource_append_dpp_pipes_for_plane_composition+0x27c/0x3b0 [amdgpu]\n[   40.964942]  dml2_validate+0x504/0x750 [amdgpu]\n[   40.965117]  ? dml21_copy+0x95/0xb0 [amdgpu]\n[   40.965291]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.965295]  dcn401_validate_bandwidth+0x4e/0x70 [amdgpu]\n[   40.965491]  update_planes_and_stream_state+0x38d/0x5c0 [amdgpu]\n[   40.965672]  update_planes_and_stream_v3+0x52/0x1e0 [amdgpu]\n[   40.965845]  ? srso_alias_return_thunk+0x5/0x7f\n[   40.965849]  dc_update_planes_and_stream+0x71/0xb0 [amdgpu]\n\nFix this by adding a guard for checking cursor width before triggering\nthe size calculation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: se corrige una advertencia de UBSAN en DML2.1 Al programar una tubería fantasma, dado que cursor_width se establece explícitamente en 0, esto hace que la lógica de cálculo active un desbordamiento para un int sin signo que activa la comprobación UBSAN del kernel como se muestra a continuación: [ 40.962845] UBSAN: desplazamiento fuera de los límites en /tmp/amd.EfpumTkO/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c:3312:34 [ 40.962849] El exponente de desplazamiento 4294967170 es demasiado grande para el tipo de 32 bits 'unsigned int' [ 40.962852] CPU: 1 PID: 1670 Comm: gnome-shell Contaminado: GW OE 6.5.0-41-generic #41~22.04.2-Ubuntu [ 40.962854] Nombre del hardware: Gigabyte Technology Co., Ltd. X670E AORUS PRO X/X670E AORUS PRO X, BIOS F21 01/10/2024 [ 40.962856] Seguimiento de llamadas: [ 40.962857]  [ 40.962860] dump_stack_lvl+0x48/0x70 [ 40.962870] dump_stack+0x10/0x20 [ 40.962872] __ubsan_handle_shift_out_of_bounds+0x1ac/0x360 [ 40.962878] CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport+0x18b8/0x2790 [amdgpu] [ 40.963534] ? srso_alias_return_thunk+0x5/0x7f [ 40.963536] ? srso_alias_return_thunk+0x5/0x7f [ 40.963909] ? srso_alias_return_thunk+0x5/0x7f [ 40.964763] ? recurso_agregar_dpp_tuberías_para_composición_de_planos+0x27c/0x3b0 [amdgpu] [ 40.964942] dml2_validate+0x504/0x750 [amdgpu] [ 40.965117] ? dml21_copy+0x95/0xb0 [amdgpu] [ 40.965291] ? srso_alias_return_thunk+0x5/0x7f [ 40.965295] dcn401_validate_bandwidth+0x4e/0x70 [amdgpu] [ 40.965491] update_planes_and_stream_state+0x38d/0x5c0 [amdgpu] [ 40.965672] update_planes_and_stream_v3+0x52/0x1e0 [amdgpu] [ 40.965845] ? srso_alias_return_thunk+0x5/0x7f [ 40.965849] dc_update_planes_and_stream+0x71/0xb0 [amdgpu] Solucione esto agregando una protección para verificar el ancho del cursor antes de activar el cálculo del tamaño."
    }
  ],
  "lastModified": "2026-06-17T08:03:47.737",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D5FF9C2-A011-4A64-B614-F9244ED2EA0D",
              "versionEndExcluding": "6.11.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}