CVE-2021-47012

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47012
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix a use after free in siw_alloc_mr Our code analyzer reported a UAF. In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the err_out branch of siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr). My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {} section, to avoid the uaf.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 Patch
https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 Patch
https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 Patch
https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c Patch
https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 Patch
https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 Patch
https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 Patch
https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 Patch
https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c Patch
https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 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:*:*:*:*:*:*:*:*
History

09 Dec 2024, 18:24

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
First Time Linux linux Kernel
Linux
CWE CWE-416
References () https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 - () https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 - Patch
References () https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 - () https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 - Patch
References () https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 - () https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 - Patch
References () https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c - () https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c - Patch
References () https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 - () https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 - Patch

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 - () https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63 -
References () https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 - () https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4 -
References () https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 - () https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4 -
References () https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c - () https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c -
References () https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 - () https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155 -
Summary
  • (es) En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: RDMA/siw: Corrige un use after free en siw_alloc_mr Nuestro analizador de código informó un UAF. En siw_alloc_mr(), llama a siw_mr_add_mem(mr,..). En la implementación de siw_mr_add_mem(), mem se asigna a mr-&gt;mem y luego mem se libera mediante kfree(mem) si xa_alloc_ciclic() falla. Aquí, mr-&gt;mem todavía apunta a un objeto liberado. Después, la ejecución continúa hasta la rama err_out de siw_alloc_mr, y el mr-&gt;mem liberado se usa en siw_mr_drop_mem(mr). Mi parche mueve "mr-&gt;mem = mem" detrás de la sección if (xa_alloc_ciclic(..)&lt;0) {}, para evitar el uaf.

28 Feb 2024, 09:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-28 09:15

Updated : 2024-12-09 18:24

NVD link : CVE-2021-47012

Mitre link : CVE-2021-47012

CVE.ORG link : CVE-2021-47012

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free