# CVE-2021-47652: linux: In the Linux kernel, the following vulnerability has been resolved:  video: fbdev: smscufx: Fix null-ptr-deref in ufx...

CVE-2021-47652 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47652, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47652
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2021-47652](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47652.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2021-47652](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47652.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2021-47652](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47652.md) | Feb 26, 2025 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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