CVE-2024-56769

media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg

State: Published
Severity: Not scored
Published: Jan 6, 2025
Updated: May 11, 2026
Reserved: Dec 29, 2024

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 ...

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 035772fcd631eee2756b31cb6df249c0a8d453d7Affected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before e11778189513cd7fb2edced5bd053bc18ede8418Affected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 53106510736e734ce8b731ba871363389bfbf4c9Affected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 3876e3a1c31a58a352c6bf5d2a90e3304445a637Affected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 1d6de21f00293d819b5ca6dbe75ff1f3b6392140Affected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before c1197c1457bb7098cf46366e898eb52b41b6876aAffected 74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 2dd59fe0e19e1ab955259978082b62e5751924c7Affected
LinuxLinux	2.6.19Affected before 2.6.19Not affected 5.4.289 through 5.4.Not affected 5.10.233 through 5.10.Not affected 5.15.176 through 5.15.Not affected 6.1.123 through 6.1.Not affected 6.6.69 through 6.6.Not affected 6.12.8 through 6.12.Not affected 6.13 and laterNot affected

Product

Versions

LinuxLinux

74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 035772fcd631eee2756b31cb6df249c0a8d453d7Affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before e11778189513cd7fb2edced5bd053bc18ede8418Affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 53106510736e734ce8b731ba871363389bfbf4c9Affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 3876e3a1c31a58a352c6bf5d2a90e3304445a637Affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 1d6de21f00293d819b5ca6dbe75ff1f3b6392140Affected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before c1197c1457bb7098cf46366e898eb52b41b6876aAffected
74340b0a8bc60b400c7e5fe4950303aa6f914d16 to before 2dd59fe0e19e1ab955259978082b62e5751924c7Affected

LinuxLinux

2.6.19Affected
before 2.6.19Not affected
5.4.289 through 5.4.*Not affected
5.10.233 through 5.10.*Not affected
5.15.176 through 5.15.*Not affected
6.1.123 through 6.1.*Not affected
6.6.69 through 6.6.*Not affected
6.12.8 through 6.12.*Not affected
6.13 and laterNot affected

References

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