CVE-2021-47652

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47652
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

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

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

18 Mar 2025, 19:10

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-476
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/0fd28daec73525382e5c992db8743bf76e42cd5c - () https://git.kernel.org/stable/c/0fd28daec73525382e5c992db8743bf76e42cd5c - Patch
References () https://git.kernel.org/stable/c/1791f487f877a9e83d81c8677bd3e7b259e7cb27 - () https://git.kernel.org/stable/c/1791f487f877a9e83d81c8677bd3e7b259e7cb27 - Patch
References () https://git.kernel.org/stable/c/64ec3e678d76419f207b9cdd338dda438ca10b1c - () https://git.kernel.org/stable/c/64ec3e678d76419f207b9cdd338dda438ca10b1c - Patch
References () https://git.kernel.org/stable/c/9280ef235b05e8f19f8bc6d547b992f0a0ef398d - () https://git.kernel.org/stable/c/9280ef235b05e8f19f8bc6d547b992f0a0ef398d - Patch
References () https://git.kernel.org/stable/c/c420b540db4b5d69de0a36d8b9d9a6a79a04f05a - () https://git.kernel.org/stable/c/c420b540db4b5d69de0a36d8b9d9a6a79a04f05a - Patch
References () https://git.kernel.org/stable/c/d1b6a1f0c23b7164250479bf92e2893291dca539 - () https://git.kernel.org/stable/c/d1b6a1f0c23b7164250479bf92e2893291dca539 - Patch
References () https://git.kernel.org/stable/c/d396c651e2b508b6179bb678cc029f3becbf5170 - () https://git.kernel.org/stable/c/d396c651e2b508b6179bb678cc029f3becbf5170 - Patch
References () https://git.kernel.org/stable/c/da8b269cc0a2526ebeaccbe2484c999eb0f822cf - () https://git.kernel.org/stable/c/da8b269cc0a2526ebeaccbe2484c999eb0f822cf - Patch
References () https://git.kernel.org/stable/c/dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b - () https://git.kernel.org/stable/c/dd3a6cc7385b89ec2303f39dfc3bafa4e24cec4b - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: smscufx: Corregir null-ptr-deref en ufx_usb_probe() Recibí un informe de null-ptr-deref: ERROR: desreferencia de puntero NULL del kernel, dirección: 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 llamará a modelist para destruirlo en la ruta de manejo de errores. Pero modelist aún no se ha inicializado, por lo que dará como resultado null-ptr-deref. Inicialice modelist antes de llamar a fb_alloc_cmap() para corregir este error.
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

26 Feb 2025, 06:37

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 06:37

Updated : 2025-03-18 19:10

NVD link : CVE-2021-47652

Mitre link : CVE-2021-47652

CVE.ORG link : CVE-2021-47652

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference