CVE-2021-47652

MEDIUM EPSS 14.8%
Published Feb 26, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
14.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥3.2  –  <4.9.311
linuxlinux_kernel*≥4.10  –  <4.14.276
linuxlinux_kernel*≥4.15  –  <4.19.238
linuxlinux_kernel*≥4.20  –  <5.4.189
linuxlinux_kernel*≥5.5  –  <5.10.110
linuxlinux_kernel*≥5.11  –  <5.15.33
linuxlinux_kernel*≥5.16  –  <5.16.19
linuxlinux_kernel*≥5.17  –  <5.17.2

References 9

  • git.kernel.org https://git.kernel.org/stable/c/0fd28daec73525382e5c992db8743bf76e42cd5c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1791f487f877a9e83d81c8677bd3e7b259e7cb27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/64ec3e678d76419f207b9cdd338dda438ca10b1c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9280ef235b05e8f19f8bc6d547b992f0a0ef398d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c420b540db4b5d69de0a36d8b9d9a6a79a04f05a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1b6a1f0c23b7164250479bf92e2893291dca539
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d396c651e2b508b6179bb678cc029f3becbf5170
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da8b269cc0a2526ebeaccbe2484c999eb0f822cf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0fd28daec73525382e5c992db8743bf76e42cd5c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1791f487f877a9e83d81c8677bd3e7b259e7cb27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/64ec3e678d76419f207b9cdd338dda438ca10b1c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9280ef235b05e8f19f8bc6d547b992f0a0ef398d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c420b540db4b5d69de0a36d8b9d9a6a79a04f05a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1b6a1f0c23b7164250479bf92e2893291dca539
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d396c651e2b508b6179bb678cc029f3becbf5170
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da8b269cc0a2526ebeaccbe2484c999eb0f822cf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b
    Patch