CVE-2023-52849

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2023-52849
In the Linux kernel, the following vulnerability has been resolved: cxl/mem: Fix shutdown order Ira reports that removing cxl_mock_mem causes a crash with the following trace: BUG: kernel NULL pointer dereference, address: 0000000000000044 [..] RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core] [..] Call Trace: <TASK> cxl_region_detach+0xe8/0x210 [cxl_core] cxl_decoder_kill_region+0x27/0x40 [cxl_core] cxld_unregister+0x29/0x40 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 device_unregister+0x13/0x60 devm_release_action+0x4d/0x90 ? __pfx_unregister_port+0x10/0x10 [cxl_core] delete_endpoint+0x121/0x130 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 device_del+0x155/0x3e0 ? lock_release+0x142/0x290 cdev_device_del+0x15/0x50 cxl_memdev_unregister+0x54/0x70 [cxl_core] This crash is due to the clearing out the cxl_memdev's driver context (@cxlds) before the subsystem is done with it. This is ultimately due to the region(s), that this memdev is a member, being torn down and expecting to be able to de-reference @cxlds, like here: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) ... if (cxlds->rcd) goto endpoint_reset; ... Fix it by keeping the driver context valid until memdev-device unregistration, and subsequently the entire stack of related dependencies, unwinds.

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/0ca074f7d788627a4e0b047ca5fbdb5fc567220c Patch
https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f Patch
https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b Patch
https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 Patch
https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae Patch
https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c Patch
https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f Patch
https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b Patch
https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 Patch
https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae 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

30 Dec 2024, 20:09

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c - () https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c - Patch
References () https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f - () https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f - Patch
References () https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b - () https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b - Patch
References () https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 - () https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 - Patch
References () https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae - () https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae - Patch

21 Nov 2024, 08:40

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: cxl/mem: arreglo del orden de apagado. Ira informa que la eliminación de cxl_mock_mem causa un bloqueo con el siguiente rastro: ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000044 [..] RIP: 0010: cxl_region_decode_reset+0x7f/0x180 [cxl_core] [..] Seguimiento de llamadas: cxl_region_detach+0xe8/0x210 [cxl_core] cxl_decoder_kill_region+0x27/0x40 [cxl_core] cxld_unregister+0x29/0x40 [cxl_core] 0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 dispositivo_del+0x155/0x3e0 device_unregister+0x13/0x60 devm_release_action+0x4d/0x90 ? __pfx_unregister_port+0x10/0x10 [cxl_core] delete_endpoint+0x121/0x130 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 dispositivo_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x15 0 dispositivo_del+0x155/0x3e0? lock_release+0x142/0x290 cdev_device_del+0x15/0x50 cxl_memdev_unregister+0x54/0x70 [cxl_core] Este bloqueo se debe a que se borró el contexto del controlador de cxl_memdev (@cxlds) antes de que el subsistema termine con él. En última instancia, esto se debe a que las regiones de las que este memdev es miembro están siendo derribadas y esperan poder eliminar la referencia a @cxlds, como aquí: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) .. si (cxlds-&gt;rcd) pasa a endpoint_reset; ... Solucionelo manteniendo válido el contexto del controlador hasta que se cancele el registro del dispositivo memdev y, posteriormente, toda la pila de dependencias relacionadas.
References () https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c - () https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c -
References () https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f - () https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f -
References () https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b - () https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b -
References () https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 - () https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209 -
References () https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae - () https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae -

21 May 2024, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 16:15

Updated : 2024-12-30 20:09

NVD link : CVE-2023-52849

Mitre link : CVE-2023-52849

CVE.ORG link : CVE-2023-52849

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference