cve-2023-52849
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2024-08-02 23:11
Severity
Summary
cxl/mem: Fix shutdown order
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52849\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:22.023\",\"lastModified\":\"2024-05-21T16:53:56.550\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncxl/mem: Fix shutdown order\\n\\nIra reports that removing cxl_mock_mem causes a crash with the following\\ntrace:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000044\\n [..]\\n RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core]\\n [..]\\n Call Trace:\\n  \u003cTASK\u003e\\n  cxl_region_detach+0xe8/0x210 [cxl_core]\\n  cxl_decoder_kill_region+0x27/0x40 [cxl_core]\\n  cxld_unregister+0x29/0x40 [cxl_core]\\n  devres_release_all+0xb8/0x110\\n  device_unbind_cleanup+0xe/0x70\\n  device_release_driver_internal+0x1d2/0x210\\n  bus_remove_device+0xd7/0x150\\n  device_del+0x155/0x3e0\\n  device_unregister+0x13/0x60\\n  devm_release_action+0x4d/0x90\\n  ? __pfx_unregister_port+0x10/0x10 [cxl_core]\\n  delete_endpoint+0x121/0x130 [cxl_core]\\n  devres_release_all+0xb8/0x110\\n  device_unbind_cleanup+0xe/0x70\\n  device_release_driver_internal+0x1d2/0x210\\n  bus_remove_device+0xd7/0x150\\n  device_del+0x155/0x3e0\\n  ? lock_release+0x142/0x290\\n  cdev_device_del+0x15/0x50\\n  cxl_memdev_unregister+0x54/0x70 [cxl_core]\\n\\nThis crash is due to the clearing out the cxl_memdev\u0027s driver context\\n(@cxlds) before the subsystem is done with it. This is ultimately due to\\nthe region(s), that this memdev is a member, being torn down and expecting\\nto be able to de-reference @cxlds, like here:\\n\\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\\n...\\n                if (cxlds-\u003ercd)\\n                        goto endpoint_reset;\\n...\\n\\nFix it by keeping the driver context valid until memdev-device\\nunregistration, and subsequently the entire stack of related\\ndependencies, unwinds.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: cxl/mem: arreglo del orden de apagado. Ira informa que la eliminaci\u00f3n de cxl_mock_mem causa un bloqueo con el siguiente rastro: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 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 borr\u00f3 el contexto del controlador de cxl_memdev (@cxlds) antes de que el subsistema termine con \u00e9l. En \u00faltima instancia, esto se debe a que las regiones de las que este memdev es miembro est\u00e1n siendo derribadas y esperan poder eliminar la referencia a @cxlds, como aqu\u00ed: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) .. si (cxlds-\u0026gt;rcd) pasa a endpoint_reset; ... Solucionelo manteniendo v\u00e1lido el contexto del controlador hasta que se cancele el registro del dispositivo memdev y, posteriormente, toda la pila de dependencias relacionadas.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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