CVE-2025-21870
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers Other, non DAI copier widgets could have the same stream name (sname) as the ALH copier and in that case the copier->data is NULL, no alh_data is attached, which could lead to NULL pointer dereference. We could check for this NULL pointer in sof_ipc4_prepare_copier_module() and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai() will miscalculate the ALH device count, causing broken audio. The correct fix is to harden the matching logic by making sure that the 1. widget is a DAI widget - so dai = w->private is valid 2. the dai (and thus the copier) is ALH copier
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-03-27 14:15:48.543000
Last modified
2026-10-30 13:17:53.020000
View original CVE JSON
{
"id": "CVE-2025-21870",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-03-27T14:15:48.543",
"lastModified": "2026-10-30T13:17:53.020",
"vulnStatus": "Modified",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers\n\nOther, non DAI copier widgets could have the same stream name (sname) as\nthe ALH copier and in that case the copier->data is NULL, no alh_data is\nattached, which could lead to NULL pointer dereference.\nWe could check for this NULL pointer in sof_ipc4_prepare_copier_module()\nand avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()\nwill miscalculate the ALH device count, causing broken audio.\n\nThe correct fix is to harden the matching logic by making sure that the\n1. widget is a DAI widget - so dai = w->private is valid\n2. the dai (and thus the copier) is ALH copier"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: SOF: ipc4-topology: Bucles reforzados para la búsqueda de copiadores ALH. Otros widgets de copiadores no DAI podrían tener el mismo nombre de flujo (sname) que el copiador ALH y, en ese caso, copier->data es NULL, sin alh_data adjunto, lo que podría provocar una desreferencia de puntero NULL. Podríamos comprobar este puntero NULL en sof_ipc4_prepare_copier_module() y evitar el fallo, pero un bucle similar en sof_ipc4_widget_setup_comp_dai() calcularía erróneamente el número de dispositivos ALH, lo que provocaría un audio interrumpido. La solución correcta es reforzar la lógica de coincidencia asegurándose de que: 1. el widget sea un widget DAI, por lo que dai = w->private es válido; 2. el dai (y, por lo tanto, el copiador) sea un copiador ALH."
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