CVE-2021-47652 (GCVE-0-2021-47652)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-05-04 07:15
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()
I got a null-ptr-deref report:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
RIP: 0010:fb_destroy_modelist+0x38/0x100
...
Call Trace:
ufx_usb_probe.cold+0x2b5/0xac1 [smscufx]
usb_probe_interface+0x1aa/0x3c0 [usbcore]
really_probe+0x167/0x460
...
ret_from_fork+0x1f/0x30
If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will
be called to destroy modelist in the error handling path. But modelist
has not been initialized yet, so it will result in null-ptr-deref.
Initialize modelist before calling fb_alloc_cmap() to fix this bug.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 Version: 3c8a63e22a0802fd56380f6ab305b419f18eb6f5 |
||||||
|
|||||||||
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But modelist\\nhas not been initialized yet, so it will result in null-ptr-deref.\\n\\nInitialize modelist before calling fb_alloc_cmap() to fix this bug.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: smscufx: Corregir null-ptr-deref en ufx_usb_probe() Recib\u00ed un informe de null-ptr-deref: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000000 ... RIP: 0010:fb_destroy_modelist+0x38/0x100 ... Seguimiento de llamadas: ufx_usb_probe.cold+0x2b5/0xac1 [smscufx] usb_probe_interface+0x1aa/0x3c0 [usbcore] really_probe+0x167/0x460 ... ret_from_fork+0x1f/0x30 Si fb_alloc_cmap() falla en ufx_usb_probe(), fb_destroy_modelist() Se llamar\u00e1 a modelist para destruirlo en la ruta de manejo de errores. Pero modelist a\u00fan no se ha inicializado, por lo que dar\u00e1 como resultado null-ptr-deref. 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