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CVE-2026-53348

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

ASoC: SDCA: fix NULL pointer dereference in sdca_dev_unregister_functions

sdca_dev_unregister_functions() iterates over all SDCA function descriptors and calls sdca_dev_unregister() on each func_dev without checking for NULL. When a function registration has failed partway through, or the device cleanup races with probe deferral, func_dev entries may be NULL, leading to a kernel oops:

This was observed on a Lenovo ThinkPad X1 Carbon G14 (Panther Lake) with the SOF audio driver probe failing due to missing Panther Lake firmware, causing the subsequent cleanup of SoundWire devices to trigger the crash.

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Fix this with three changes:

Detalles técnicos trazas, registros y código del informe original
  BUG: kernel NULL pointer dereference, address: 0000000000000040
  RIP: 0010:device_del+0x1e/0x3e0
  Call Trace:
   sdca_dev_unregister_functions+0x37/0x60 [snd_soc_sdca]
   release_nodes+0x35/0xb0
   devres_release_all+0x90/0x100
   device_unbind_cleanup+0xe/0x80
   device_release_driver_internal+0x1c1/0x200
   bus_remove_device+0xc6/0x130
   device_del+0x161/0x3e0
   device_unregister+0x17/0x60
   sdw_delete_slave+0xb6/0xd0 [soundwire_bus]
   sdw_bus_master_delete+0x1e/0x50 [soundwire_bus]
   ...
   sof_probe_work+0x19/0x30 [snd_sof]

1) Add a NULL guard in sdca_dev_unregister() so that callers do not
   need to pre-validate the pointer (defense in depth).

2) In sdca_dev_unregister_functions(), skip NULL func_dev entries
   and clear func_dev to NULL after unregistration, making the
   function idempotent and safe against double-invocation.

3) In sdca_dev_register_functions(), roll back all previously
   registered functions when a later one fails, so the function
   array is never left in a partially-populated state.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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  "published": "2026-07-01T14:16:42.907",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SDCA: fix NULL pointer dereference in sdca_dev_unregister_functions\n\nsdca_dev_unregister_functions() iterates over all SDCA function\ndescriptors and calls sdca_dev_unregister() on each func_dev without\nchecking for NULL. When a function registration has failed partway\nthrough, or the device cleanup races with probe deferral, func_dev\nentries may be NULL, leading to a kernel oops:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  RIP: 0010:device_del+0x1e/0x3e0\n  Call Trace:\n   sdca_dev_unregister_functions+0x37/0x60 [snd_soc_sdca]\n   release_nodes+0x35/0xb0\n   devres_release_all+0x90/0x100\n   device_unbind_cleanup+0xe/0x80\n   device_release_driver_internal+0x1c1/0x200\n   bus_remove_device+0xc6/0x130\n   device_del+0x161/0x3e0\n   device_unregister+0x17/0x60\n   sdw_delete_slave+0xb6/0xd0 [soundwire_bus]\n   sdw_bus_master_delete+0x1e/0x50 [soundwire_bus]\n   ...\n   sof_probe_work+0x19/0x30 [snd_sof]\n\nThis was observed on a Lenovo ThinkPad X1 Carbon G14 (Panther Lake)\nwith the SOF audio driver probe failing due to missing Panther Lake\nfirmware, causing the subsequent cleanup of SoundWire devices to\ntrigger the crash.\n\nFix this with three changes:\n\n1) Add a NULL guard in sdca_dev_unregister() so that callers do not\n   need to pre-validate the pointer (defense in depth).\n\n2) In sdca_dev_unregister_functions(), skip NULL func_dev entries\n   and clear func_dev to NULL after unregistration, making the\n   function idempotent and safe against double-invocation.\n\n3) In sdca_dev_register_functions(), roll back all previously\n   registered functions when a later one fails, so the function\n   array is never left in a partially-populated state."
    }
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  "lastModified": "2026-07-22T19:15:37.717",
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