CVE-2022-50511

Estado: AnalizadaMedia (5.5)—

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

lib/fonts: fix undefined behavior in bit shift for get_default_font

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 lib/fonts/fonts.c:139:20
left shift of 1 by 31 places cannot be represented in type 'int'
 <TASK>
 dump_stack_lvl+0x7d/0xa5
 dump_stack+0x15/0x1b
 ubsan_epilogue+0xe/0x4e
 __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
 get_default_font+0x1c7/0x1f0
 fbcon_startup+0x347/0x3a0
 do_take_over_console+0xce/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

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 6/10/2026

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

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2022-50511",
  "cveTags": [],
  "metrics": {
    "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
      }
    ]
  },
  "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": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "e039929e36818507e90901edae87f6fa8bc81093",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "c9a9aa02f0fa3318e0ae5774f404419a1b4759ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "e83b47580a0738361772d6f24286adfdaba57e36",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "9c14a85e18a58c102ec223144b7edb5b345c1bea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "890d91b31f4874361e0df047f57d268a7021cb12",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c81f717cb9e0bd91dc4b98753cb2705ab0fe2801",
              "lessThan": "6fe888c4d2fb174408e4540bb2d5602b9f507f90",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "lib/fonts/fonts.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.23"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.23",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.86",
              "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": [
            "lib/fonts/fonts.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-07T16:15:34.337",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/fonts: fix undefined behavior in bit shift for get_default_font\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 lib/fonts/fonts.c:139:20\nleft shift of 1 by 31 places cannot be represented in type 'int'\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 get_default_font+0x1c7/0x1f0\n fbcon_startup+0x347/0x3a0\n do_take_over_console+0xce/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": "2026-06-17T05:23:41.743",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "09DC411B-ABB2-47ED-8534-FF3102B7F0AE",
              "versionEndExcluding": "5.4.229",
              "versionStartIncluding": "2.6.23.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D05D31FC-BD74-4F9E-B1D8-9CED62BE6F65",
              "versionEndExcluding": "5.10.163",
              "versionStartIncluding": "5.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "47237296-55D1-4ED4-8075-D00FC85A61EE",
              "versionEndExcluding": "5.15.86",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C720A569-3D93-4D77-95F6-E2B3A3267D9F",
              "versionEndExcluding": "6.0.16",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "77239F4B-6BB2-4B9E-A654-36A52396116C",
              "versionEndExcluding": "6.1.2",
              "versionStartIncluding": "6.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "23283997-5446-4B11-8C13-C668D66EC888"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8D42BA44-C69B-4170-9867-CABF93CA9BD6"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B6BCD075-9FCE-496C-9807-3A13998129B1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "460BC48C-1598-4739-A64B-A2350BC6BD28"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7700AB42-8543-4FA5-9BAF-EF2F126E9375"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B8C31F2D-385F-46CF-8F04-61157EE35013"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3588EB36-674F-49FB-A51C-0B52F8BFD9D4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc8:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3C93A9E4-08DA-44D2-B6D9-76BD287FA5DC"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.23:rc9:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C5575728-D466-4CC9-95BA-8CA433D19566"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}