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CVE-2022-50390

Estado: AnalizadaMedia (5.5)—

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

drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED

Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below:

Detalles técnicos trazas, registros y código del informe original
UBSAN: shift-out-of-bounds in ./include/drm/ttm/ttm_tt.h:122:26
left shift of 1 by 31 places cannot be represented in type 'int'
Call Trace:
 <TASK>
 dump_stack_lvl+0x7d/0xa5
 dump_stack+0x15/0x1b
 ubsan_epilogue+0xe/0x4e
 __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
 ttm_bo_move_memcpy+0x3b4/0x460 [ttm]
 bo_driver_move+0x32/0x40 [drm_vram_helper]
 ttm_bo_handle_move_mem+0x118/0x200 [ttm]
 ttm_bo_validate+0xfa/0x220 [ttm]
 drm_gem_vram_pin_locked+0x70/0x1b0 [drm_vram_helper]
 drm_gem_vram_pin+0x48/0xb0 [drm_vram_helper]
 drm_gem_vram_plane_helper_prepare_fb+0x53/0xe0 [drm_vram_helper]
 drm_gem_vram_simple_display_pipe_prepare_fb+0x26/0x30 [drm_vram_helper]
 drm_simple_kms_plane_prepare_fb+0x4d/0xe0 [drm_kms_helper]
 drm_atomic_helper_prepare_planes+0xda/0x210 [drm_kms_helper]
 drm_atomic_helper_commit+0xc3/0x1e0 [drm_kms_helper]
 drm_atomic_commit+0x9c/0x160 [drm]
 drm_client_modeset_commit_atomic+0x33a/0x380 [drm]
 drm_client_modeset_commit_locked+0x77/0x220 [drm]
 drm_client_modeset_commit+0x31/0x60 [drm]
 __drm_fb_helper_restore_fbdev_mode_unlocked+0xa7/0x170 [drm_kms_helper]
 drm_fb_helper_set_par+0x51/0x90 [drm_kms_helper]
 fbcon_init+0x316/0x790
 visual_init+0x113/0x1d0
 do_bind_con_driver+0x2a3/0x5c0
 do_take_over_console+0xa9/0x270
 do_fbcon_takeover+0xa1/0x170
 do_fb_registered+0x2a8/0x340
 fbcon_fb_registered+0x47/0xe0
 register_framebuffer+0x294/0x4a0
 __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]
 drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]
 drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]
 drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]
 bochs_pci_probe+0x6ca/0x772 [bochs]
 local_pci_probe+0x4d/0xb0
 pci_device_probe+0x119/0x320
 really_probe+0x181/0x550
 __driver_probe_device+0xc6/0x220
 driver_probe_device+0x32/0x100
 __driver_attach+0x195/0x200
 bus_for_each_dev+0xbb/0x120
 driver_attach+0x27/0x30
 bus_add_driver+0x22e/0x2f0
 driver_register+0xa9/0x190
 __pci_register_driver+0x90/0xa0
 bochs_pci_driver_init+0x52/0x1000 [bochs]
 do_one_initcall+0x76/0x430
 do_init_module+0x61/0x28a
 load_module+0x1f82/0x2e50
 __do_sys_finit_module+0xf8/0x190
 __x64_sys_finit_module+0x23/0x30
 do_syscall_64+0x58/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
 </TASK>

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-2022-50390",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-50390",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-14T18:50:13.515022Z"
        }
      }
    ],
    "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": "3312be8f6fc8a8dc7cef01986dbd436eab7af0f7",
              "lessThan": "c4079a34c0adef9f35a16783fb13a9084406f96d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3312be8f6fc8a8dc7cef01986dbd436eab7af0f7",
              "lessThan": "2ff0309b73d86e8591881ac035af06e01c112e89",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3312be8f6fc8a8dc7cef01986dbd436eab7af0f7",
              "lessThan": "6528971fdce0dfc0a28fec42c151a1eccdabadf5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3312be8f6fc8a8dc7cef01986dbd436eab7af0f7",
              "lessThan": "387659939c00156f8d6bab0fbc55b4eaf2b6bc5b",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "include/drm/ttm/ttm_tt.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.199",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "include/drm/ttm/ttm_tt.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-09-18T14:15:37.997",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2ff0309b73d86e8591881ac035af06e01c112e89",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/387659939c00156f8d6bab0fbc55b4eaf2b6bc5b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6528971fdce0dfc0a28fec42c151a1eccdabadf5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c4079a34c0adef9f35a16783fb13a9084406f96d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED\n\nShifting signed 32-bit value by 31 bits is undefined, so changing\nsignificant bit to unsigned. The UBSAN warning calltrace like below:\n\nUBSAN: shift-out-of-bounds in ./include/drm/ttm/ttm_tt.h:122:26\nleft shift of 1 by 31 places cannot be represented in type 'int'\nCall Trace:\n <TASK>\n dump_stack_lvl+0x7d/0xa5\n dump_stack+0x15/0x1b\n ubsan_epilogue+0xe/0x4e\n __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c\n ttm_bo_move_memcpy+0x3b4/0x460 [ttm]\n bo_driver_move+0x32/0x40 [drm_vram_helper]\n ttm_bo_handle_move_mem+0x118/0x200 [ttm]\n ttm_bo_validate+0xfa/0x220 [ttm]\n drm_gem_vram_pin_locked+0x70/0x1b0 [drm_vram_helper]\n drm_gem_vram_pin+0x48/0xb0 [drm_vram_helper]\n drm_gem_vram_plane_helper_prepare_fb+0x53/0xe0 [drm_vram_helper]\n drm_gem_vram_simple_display_pipe_prepare_fb+0x26/0x30 [drm_vram_helper]\n drm_simple_kms_plane_prepare_fb+0x4d/0xe0 [drm_kms_helper]\n drm_atomic_helper_prepare_planes+0xda/0x210 [drm_kms_helper]\n drm_atomic_helper_commit+0xc3/0x1e0 [drm_kms_helper]\n drm_atomic_commit+0x9c/0x160 [drm]\n drm_client_modeset_commit_atomic+0x33a/0x380 [drm]\n drm_client_modeset_commit_locked+0x77/0x220 [drm]\n drm_client_modeset_commit+0x31/0x60 [drm]\n __drm_fb_helper_restore_fbdev_mode_unlocked+0xa7/0x170 [drm_kms_helper]\n drm_fb_helper_set_par+0x51/0x90 [drm_kms_helper]\n fbcon_init+0x316/0x790\n visual_init+0x113/0x1d0\n do_bind_con_driver+0x2a3/0x5c0\n do_take_over_console+0xa9/0x270\n do_fbcon_takeover+0xa1/0x170\n do_fb_registered+0x2a8/0x340\n fbcon_fb_registered+0x47/0xe0\n register_framebuffer+0x294/0x4a0\n __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]\n drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]\n drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]\n drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]\n bochs_pci_probe+0x6ca/0x772 [bochs]\n local_pci_probe+0x4d/0xb0\n pci_device_probe+0x119/0x320\n really_probe+0x181/0x550\n __driver_probe_device+0xc6/0x220\n driver_probe_device+0x32/0x100\n __driver_attach+0x195/0x200\n bus_for_each_dev+0xbb/0x120\n driver_attach+0x27/0x30\n bus_add_driver+0x22e/0x2f0\n driver_register+0xa9/0x190\n __pci_register_driver+0x90/0xa0\n bochs_pci_driver_init+0x52/0x1000 [bochs]\n do_one_initcall+0x76/0x430\n do_init_module+0x61/0x28a\n load_module+0x1f82/0x2e50\n __do_sys_finit_module+0xf8/0x190\n __x64_sys_finit_module+0x23/0x30\n do_syscall_64+0x58/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n </TASK>"
    }
  ],
  "lastModified": "2026-06-17T05:23:24.983",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "105286EE-071D-4CDD-99B6-120D3B386F23",
              "versionEndExcluding": "6.0.16",
              "versionStartIncluding": "5.10"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "77239F4B-6BB2-4B9E-A654-36A52396116C",
              "versionEndExcluding": "6.1.2",
              "versionStartIncluding": "6.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}