CVE-2021-47554

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  2. Vulnerabilities (CVE)
  3. CVE-2021-47554

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

I

n the Linux kernel, the following vulnerability has been resolved: vdpa_sim: avoid putting an uninitialized iova_domain The system will crash if we put an uninitialized iova_domain, this could happen when an error occurs before initializing the iova_domain in vdpasim_create(). BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0 ... Call Trace: <TASK> put_iova_domain+0x29/0x220 vdpasim_free+0xd1/0x120 [vdpa_sim] vdpa_release_dev+0x21/0x40 [vdpa] device_release+0x33/0x90 kobject_release+0x63/0x160 vdpasim_create+0x127/0x2a0 [vdpa_sim] vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net] vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa] genl_family_rcv_msg_doit+0x112/0x140 genl_rcv_msg+0xdf/0x1d0 ... So we must make sure the iova_domain is already initialized before put it. In addition, we may get the following warning in this case: WARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70 So we must make sure the iova_cache_put() is invoked only if the iova_cache_get() is already invoked. Let's fix it together.

References
Link Resource
https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 Patch
https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd Patch
https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 Patch
https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
History

15 Jan 2025, 18:30

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 - () https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 - Patch
References () https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd - () https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd - Patch
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-908

21 Nov 2024, 06:36

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux se ha solucionado la siguiente vulnerabilidad: vdpa_sim: evitar poner un iova_domain no inicializado El sistema se bloqueará si ponemos un iova_domain no inicializado, esto podría pasar cuando ocurre un error antes de inicializar el iova_domain en vdpasim_create(). ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000000... RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0... Seguimiento de llamadas: put_iova_domain+0x29/0x220 vdpasim_free+0xd1/0x120 [vdpa_release_] desarrollo+0x21/0x40 [ vdpa] device_release+0x33/0x90 kobject_release+0x63/0x160 vdpasim_create+0x127/0x2a0 [vdpa_sim] vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net] vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [ vdpa] genl_family_rcv_msg_doit+0x112/0x140 genl_rcv_msg+0xdf/0x1d0 ... Entonces debemos asegurarnos de que iova_domain ya esté inicializado antes de colocarlo. Además, es posible que recibamos la siguiente advertencia en este caso: ADVERTENCIA: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70 Por lo tanto, debemos asegurarnos de que iova_cache_put() se invoque solo si iova_cache_get() es ya invocado. Arreglemoslo juntos.
References () https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 - () https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649 -
References () https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd - () https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd -

24 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-24 15:15

Updated : 2025-01-15 18:30

NVD link : CVE-2021-47554

Mitre link : CVE-2021-47554

CVE.ORG link : CVE-2021-47554

JSON object : View

Products Affected

linux

CWE
CWE-908

Use of Uninitialized Resource