CVE-2022-49446

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  3. CVE-2022-49446

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: nvdimm: Fix firmware activation deadlock scenarios Lockdep reports the following deadlock scenarios for CXL root device power-management, device_prepare(), operations, and device_shutdown() operations for 'nd_region' devices: Chain exists of: &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(system_transition_mutex); lock(&nvdimm_bus->reconfig_mutex); lock(system_transition_mutex); lock(&nvdimm_region_key); Chain exists of: &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cxl_root_key); lock(acpi_scan_lock); lock(&cxl_root_key); lock(&cxl_nvdimm_bridge_key); These stem from holding nvdimm_bus_lock() over hibernate_quiet_exec() which walks the entire system device topology taking device_lock() along the way. The nvdimm_bus_lock() is protecting against unregistration, multiple simultaneous ops callers, and preventing activate_show() from racing activate_store(). For the first 2, the lock is redundant. Unregistration already flushes all ops users, and sysfs already prevents multiple threads to be active in an ops handler at the same time. For the last userspace should already be waiting for its last activate_store() to complete, and does not need activate_show() to flush the write side, so this lock usage can be deleted in these attributes.

References
Link Resource
https://git.kernel.org/stable/c/2f97ebc58d5fc83ca1528cd553fa725472ab3ca8 Patch
https://git.kernel.org/stable/c/2fd853fdb40afc052de338693df1372f2ead7be7 Patch
https://git.kernel.org/stable/c/641649f31e20df630310f5c22f26c071acc676d4 Patch
https://git.kernel.org/stable/c/ceb924ee16b2c8e48dcac3d9ad6be01c40b5a228 Patch
https://git.kernel.org/stable/c/e6829d1bd3c4b58296ee9e412f7ed4d6cb390192 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

17 Mar 2025, 16:12

Type Values Removed Values Added
CWE CWE-667
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvdimm: Se corrigen los escenarios de bloqueo de activación de firmware Lockdep informa los siguientes escenarios de bloqueo para la administración de energía del dispositivo raíz CXL, device_prepare(), operaciones y operaciones device_shutdown() para dispositivos 'nd_region': Existe una cadena de: &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(system_transition_mutex); lock(&nvdimm_bus->reconfig_mutex); lock(system_transition_mutex); lock(&nvdimm_region_key); Chain exists of: &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cxl_root_key); lock(acpi_scan_lock); lock(&cxl_root_key); lock(&cxl_nvdimm_bridge_key); Estos se derivan de mantener nvdimm_bus_lock() sobre hibernate_quiet_exec() que recorre toda la topología del dispositivo del sistema tomando device_lock() en el camino. nvdimm_bus_lock() protege contra la anulación del registro, múltiples invocadores de operaciones simultáneas y evita que activate_show() compita con activate_store(). Para los primeros 2, el bloqueo es redundante. La anulación del registro ya borra todos los usuarios de operaciones, y sysfs ya evita que varios subprocesos estén activos en un controlador de operaciones al mismo tiempo. Para el último espacio de usuario ya debería estar esperando a que se complete su último activate_store(), y no necesita activate_show() para borrar el lado de escritura, por lo que este uso de bloqueo se puede eliminar en estos atributos.
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/2f97ebc58d5fc83ca1528cd553fa725472ab3ca8 - () https://git.kernel.org/stable/c/2f97ebc58d5fc83ca1528cd553fa725472ab3ca8 - Patch
References () https://git.kernel.org/stable/c/2fd853fdb40afc052de338693df1372f2ead7be7 - () https://git.kernel.org/stable/c/2fd853fdb40afc052de338693df1372f2ead7be7 - Patch
References () https://git.kernel.org/stable/c/641649f31e20df630310f5c22f26c071acc676d4 - () https://git.kernel.org/stable/c/641649f31e20df630310f5c22f26c071acc676d4 - Patch
References () https://git.kernel.org/stable/c/ceb924ee16b2c8e48dcac3d9ad6be01c40b5a228 - () https://git.kernel.org/stable/c/ceb924ee16b2c8e48dcac3d9ad6be01c40b5a228 - Patch
References () https://git.kernel.org/stable/c/e6829d1bd3c4b58296ee9e412f7ed4d6cb390192 - () https://git.kernel.org/stable/c/e6829d1bd3c4b58296ee9e412f7ed4d6cb390192 - Patch

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-10-01 20:16

NVD link : CVE-2022-49446

Mitre link : CVE-2022-49446

CVE.ORG link : CVE-2022-49446

JSON object : View

Products Affected

linux

CWE
CWE-667

Improper Locking