fkie_cve-2024-56769
Vulnerability from fkie_nvd
Published
2025-01-06 17:15
Modified
2025-01-09 16:16
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: media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg Syzbot reports [1] an uninitialized value issue found by KMSAN in dib3000_read_reg(). Local u8 rb[2] is used in i2c_transfer() as a read buffer; in case that call fails, the buffer may end up with some undefined values. Since no elaborate error handling is expected in dib3000_write_reg(), simply zero out rb buffer to mitigate the problem. [1] Syzkaller report dvb-usb: bulk message failed: -22 (6/0) ===================================================== BUG: KMSAN: uninit-value in dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dibusb_dib3000mb_frontend_attach+0x155/0x2f0 drivers/media/usb/dvb-usb/dibusb-mb.c:31 dvb_usb_adapter_frontend_init+0xed/0x9a0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [inline] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline] dvb_usb_device_init+0x25a8/0x3760 drivers/media/usb/dvb-usb/dvb-usb-init.c:310 dibusb_probe+0x46/0x250 drivers/media/usb/dvb-usb/dibusb-mb.c:110 ... Local variable rb created at: dib3000_read_reg+0x86/0x4e0 drivers/media/dvb-frontends/dib3000mb.c:54 dib3000mb_attach+0x123/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 ...
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/035772fcd631eee2756b31cb6df249c0a8d453d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d6de21f00293d819b5ca6dbe75ff1f3b6392140Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2dd59fe0e19e1ab955259978082b62e5751924c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3876e3a1c31a58a352c6bf5d2a90e3304445a637Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53106510736e734ce8b731ba871363389bfbf4c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1197c1457bb7098cf46366e898eb52b41b6876aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e11778189513cd7fb2edced5bd053bc18ede8418
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13


To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg\n\nSyzbot reports [1] an uninitialized value issue found by KMSAN in\ndib3000_read_reg().\n\nLocal u8 rb[2] is used in i2c_transfer() as a read buffer; in case\nthat call fails, the buffer may end up with some undefined values.\n\nSince no elaborate error handling is expected in dib3000_write_reg(),\nsimply zero out rb buffer to mitigate the problem.\n\n[1] Syzkaller report\ndvb-usb: bulk message failed: -22 (6/0)\n=====================================================\nBUG: KMSAN: uninit-value in dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758\n dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758\n dibusb_dib3000mb_frontend_attach+0x155/0x2f0 drivers/media/usb/dvb-usb/dibusb-mb.c:31\n dvb_usb_adapter_frontend_init+0xed/0x9a0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290\n dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [inline]\n dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline]\n dvb_usb_device_init+0x25a8/0x3760 drivers/media/usb/dvb-usb/dvb-usb-init.c:310\n dibusb_probe+0x46/0x250 drivers/media/usb/dvb-usb/dibusb-mb.c:110\n...\nLocal variable rb created at:\n dib3000_read_reg+0x86/0x4e0 drivers/media/dvb-frontends/dib3000mb.c:54\n dib3000mb_attach+0x123/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758\n..."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: media: dvb-frontends: dib3000mb: correcci\u00f3n de un valor no inicializado en dib3000_write_reg Syzbot informa [1] de un problema de valor no inicializado encontrado por KMSAN en dib3000_read_reg(). El rb u8 local [2] se utiliza en i2c_transfer() como un b\u00fafer de lectura; en caso de que esa llamada falle, el b\u00fafer puede terminar con algunos valores indefinidos. Dado que no se espera una gesti\u00f3n elaborada de errores en dib3000_write_reg(), simplemente ponga a cero el b\u00fafer rb para mitigar el problema. [1] Syzkaller informa dvb-usb: error en el mensaje masivo: -22 (6/0) ======================================================= ERROR: KMSAN: valor no inicializado en dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 dibusb_dib3000mb_frontend_attach+0x155/0x2f0 drivers/media/usb/dvb-usb/dibusb-mb.c:31 dvb_usb_adapter_frontend_init+0xed/0x9a0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [en l\u00ednea] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [en l\u00ednea] dvb_usb_device_init+0x25a8/0x3760 drivers/media/usb/dvb-usb/dvb-usb-init.c:310 dibusb_probe+0x46/0x250 drivers/media/usb/dvb-usb/dibusb-mb.c:110 ... Variable local rb manipulado en: dib3000_read_reg+0x86/0x4e0 drivers/media/dvb-frontends/dib3000mb.c:54 dib3000mb_attach+0x123/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758 ..."
    }
  ],
  "id": "CVE-2024-56769",
  "lastModified": "2025-01-09T16:16:24.203",
  "metrics": {
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          "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"
      }
    ]
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  "published": "2025-01-06T17:15:44.063",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-908"
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      "source": "nvd@nist.gov",
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}


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