CVE-2021-47652: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 3.2, before 4.9.311 (fixed in 4.9.311); from 4.10, before 4.14.276 (fixed in 4.14.276); from 4.15, before 4.19.238 (fixed in 4.19.238); from 4.20, before 5.4.189 (fixed in 5.4.189); from 5.5, before 5.10.110 (fixed in 5.10.110); from 5.11, before 5.15.33 (fixed in 5.15.33); …

Published 2025-02-26. Last modified 2026-06-17.