CVE-2021-47005

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47005
In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: Fix NULL pointer dereference for ->get_features() get_features ops of pci_epc_ops may return NULL, causing NULL pointer dereference in pci_epf_test_alloc_space function. Let us add a check for pci_epc_feature pointer in pci_epf_test_bind before we access it to avoid any such NULL pointer dereference and return -ENOTSUPP in case pci_epc_feature is not found. When the patch is not applied and EPC features is not implemented in the platform driver, we see the following dump due to kernel NULL pointer dereference. Call trace: pci_epf_test_bind+0xf4/0x388 pci_epf_bind+0x3c/0x80 pci_epc_epf_link+0xa8/0xcc configfs_symlink+0x1a4/0x48c vfs_symlink+0x104/0x184 do_symlinkat+0x80/0xd4 __arm64_sys_symlinkat+0x1c/0x24 el0_svc_common.constprop.3+0xb8/0x170 el0_svc_handler+0x70/0x88 el0_svc+0x8/0x640 Code: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ end trace a438e3c5a24f9df0 ]---

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/0169d4f0bee44fdfef908c13ed21fcb326c38695 Patch
https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 Patch
https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 Patch
https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 Patch
https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 Patch
https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 Patch
https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 Patch
https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 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:*:*:*:*:*:*:*:*
History

09 Dec 2024, 18:23

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-476
References () https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 - () https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 - Patch
References () https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 - () https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 - Patch
References () https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 - () https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 - Patch
References () https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 - () https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 - Patch

21 Nov 2024, 06:35

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: PCI: endpoint: corrigió la desreferencia del puntero NULL para ->get_features() las operaciones get_features de pci_epc_ops pueden devolver NULL, lo que provoca la desreferencia del puntero NULL en la función pci_epf_test_alloc_space. Agreguemos una verificación del puntero pci_epc_feature en pci_epf_test_bind antes de acceder a él para evitar dicha desreferencia del puntero NULL y devolvamos -ENOTSUPP en caso de que no se encuentre pci_epc_feature. Cuando no se aplica el parche y las funciones de EPC no se implementan en el controlador de la plataforma, vemos el siguiente volcado debido a la desreferencia del puntero NULL del kernel. Rastreo de llamadas: pci_epf_test_bind+0xf4/0x388 pci_epf_bind+0x3c/0x80 pci_epc_epf_link+0xa8/0xcc configfs_symlink+0x1a4/0x48c vfs_symlink+0x104/0x184 do_symlinkat+0x80/0xd4 __arm64_sys _symlinkat+0x1c/0x24 el0_svc_common.constprop.3+0xb8/0x170 el0_svc_handler+0x70 /0x88 el0_svc+0x8/0x640 Código: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ final de seguimiento a438e3c5a24f9df0 ]---
References () https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 - () https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 -
References () https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 - () https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 -
References () https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 - () https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 -
References () https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 - () https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 -

28 Feb 2024, 09:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-28 09:15

Updated : 2024-12-09 18:23

NVD link : CVE-2021-47005

Mitre link : CVE-2021-47005

CVE.ORG link : CVE-2021-47005

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference