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CVE-2024-56769 – DVB-USB KMSAN Uninitialized Value in Dib3000 Frontend

The following table lists the changes that have been made to the
CVE-2024-56769 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 06, 2025

    Action Type Old Value New Value
    Added Description 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
    …
    Added Reference https://git.kernel.org/stable/c/1d6de21f00293d819b5ca6dbe75ff1f3b6392140
    Added Reference https://git.kernel.org/stable/c/2dd59fe0e19e1ab955259978082b62e5751924c7
    Added Reference https://git.kernel.org/stable/c/3876e3a1c31a58a352c6bf5d2a90e3304445a637
    Added Reference https://git.kernel.org/stable/c/c1197c1457bb7098cf46366e898eb52b41b6876a
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