CVE-2021-47217

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47217
In the Linux kernel, the following vulnerability has been resolved: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails Check for a valid hv_vp_index array prior to derefencing hv_vp_index when setting Hyper-V's TSC change callback. If Hyper-V setup failed in hyperv_init(), the kernel will still report that it's running under Hyper-V, but will have silently disabled nearly all functionality. BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Call Trace: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30

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/8823ea27fff6084bbb4bc71d15378fae0220b1d8 Patch
https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c Patch
https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 Patch
https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 Patch
https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 Patch
https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 Patch
https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c Patch
https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 Patch
https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 Patch
https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 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:5.16:rc1:*:*:*:*:*:*
History

14 Jan 2025, 14:44

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 - () https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 - Patch
References () https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c - () https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c - Patch
References () https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 - () https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 - Patch
References () https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 - () https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 - Patch
References () https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 - () https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-476
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*

21 Nov 2024, 06:35

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/hyperv: Se corrige la desreferencia NULL en set_hv_tscchange_cb() si falla la configuración de Hyper-V. Verifique si hay una matriz hv_vp_index válida antes de desreferenciar hv_vp_index al configurar la devolución de llamada de cambio de TSC de Hyper-V. Si la configuración de Hyper-V falló en hyperv_init(), el kernel aún informará que se está ejecutando bajo Hyper-V, pero habrá deshabilitado silenciosamente casi todas las funciones. ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000010 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - página no presente PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 No contaminado 5.15.0-rc2+ #75 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 Código: &lt;8b&gt; 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Seguimiento de llamadas: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30
References () https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 - () https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 -
References () https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c - () https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c -
References () https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 - () https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 -
References () https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 - () https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 -
References () https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 - () https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 -

10 Apr 2024, 19:49

Type Values Removed Values Added
New CVE
Information

Published : 2024-04-10 19:15

Updated : 2025-01-14 14:44

NVD link : CVE-2021-47217

Mitre link : CVE-2021-47217

CVE.ORG link : CVE-2021-47217

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference