CVE-2022-49300

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49300
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.

4.7 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

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/122e4adaff2439f1cc18cc7e931980fa7560df5c Patch
https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4 Patch
https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0 Patch
https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 Patch
https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa Patch
https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 Patch
https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810 Patch
https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

14 Apr 2025, 20:08

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c - () https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c - Patch
References () https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4 - () https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4 - Patch
References () https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0 - () https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0 - Patch
References () https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 - () https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 - Patch
References () https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa - () https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa - Patch
References () https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 - () https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 - Patch
References () https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810 - () https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810 - Patch
References () https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602 - () https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nbd: se corrige la ejecución entre nbd_alloc_config() y la eliminación del módulo Cuando se elimina el módulo nbd, nbd_alloc_config() puede ser llamado simultáneamente por nbd_genl_connect(), aunque try_module_get() devolverá falso, pero nbd_alloc_config() no lo maneja. La ejecución puede provocar la fuga de nbd_config y sus recursos relacionados (por ejemplo, recv_workq) y oops en nbd_read_stat() debido a la descarga del módulo nbd como se muestra a continuación: ERROR: desreferencia de puntero NULL del núcleo, dirección: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 No contaminado 5.14.0+ #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) Cola de trabajo: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Rastreo de llamadas: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Lo solucionamos comprobando el valor de retorno de try_module_get() en nbd_alloc_config(). Como nbd_alloc_config() puede devolver ERR_PTR(-ENODEV), asigne nbd->config solo cuando nbd_alloc_config() tenga éxito para garantizar que el valor de nbd->config sea binario (válido o NULL). También se agregó un mensaje de depuración para comprobar el contador de referencia de nbd_config durante la eliminación del módulo.
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.7
CWE CWE-476
CWE-362
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-04-14 20:08

NVD link : CVE-2022-49300

Mitre link : CVE-2022-49300

CVE.ORG link : CVE-2022-49300

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-476

NULL Pointer Dereference