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CVE-2025-39855

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: ice: fix NULL access of tx->in_use in ice_ptp_ts_irq The E810 device has support for a "low latency" firmware interface to access and read the Tx timestamps. This interface does not use the standard Tx timestamp logic, due to the latency overhead of proxying sideband command requests over the firmware AdminQ. The logic still makes use of the Tx timestamp tracking structure, ice_ptp_tx, as it uses the same "ready" bitmap to track which Tx timestamps complete. Unfortunately, the ice_ptp_ts_irq() function does not check if the tracker is initialized before its first access. This results in NULL dereference or use-after-free bugs similar to the following: [245977.278756] BUG: kernel NULL pointer dereference, address: 0000000000000000 [245977.278774] RIP: 0010:_find_first_bit+0x19/0x40 [245977.278796] Call Trace: [245977.278809] ? ice_misc_intr+0x364/0x380 [ice] This can occur if a Tx timestamp interrupt races with the driver reset logic. Fix this by only checking the in_use bitmap (and other fields) if the tracker is marked as initialized. The reset flow will clear the init field under lock before it tears the tracker down, thus preventing any use-after-free or NULL access.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-19 16:15:44.437000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39855",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-19T16:15:44.437",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: fix NULL access of tx->in_use in ice_ptp_ts_irq\n\nThe E810 device has support for a \"low latency\" firmware interface to\naccess and read the Tx timestamps. This interface does not use the standard\nTx timestamp logic, due to the latency overhead of proxying sideband\ncommand requests over the firmware AdminQ.\n\nThe logic still makes use of the Tx timestamp tracking structure,\nice_ptp_tx, as it uses the same \"ready\" bitmap to track which Tx\ntimestamps complete.\n\nUnfortunately, the ice_ptp_ts_irq() function does not check if the tracker\nis initialized before its first access. This results in NULL dereference or\nuse-after-free bugs similar to the following:\n\n[245977.278756] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[245977.278774] RIP: 0010:_find_first_bit+0x19/0x40\n[245977.278796] Call Trace:\n[245977.278809]  ? ice_misc_intr+0x364/0x380 [ice]\n\nThis can occur if a Tx timestamp interrupt races with the driver reset\nlogic.\n\nFix this by only checking the in_use bitmap (and other fields) if the\ntracker is marked as initialized. The reset flow will clear the init field\nunder lock before it tears the tracker down, thus preventing any\nuse-after-free or NULL access."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nice: corrige el acceso NULL de tx->in_use en ice_ptp_ts_irq\n\nEl dispositivo E810 tiene soporte para una interfaz de firmware de 'baja latencia' para acceder y leer las marcas de tiempo Tx. Esta interfaz no utiliza la lógica estándar de marcas de tiempo Tx, debido a la sobrecarga de latencia de la intermediación de solicitudes de comandos de banda lateral a través de la AdminQ del firmware.\n\nLa lógica aún utiliza la estructura de seguimiento de marcas de tiempo Tx, ice_ptp_tx, ya que usa el mismo mapa de bits 'ready' para rastrear qué marcas de tiempo Tx se completan.\n\nDesafortunadamente, la función ice_ptp_ts_irq() no verifica si el rastreador está inicializado antes de su primer acceso. Esto resulta en errores de desreferencia NULL o uso después de liberación similares a los siguientes:\n\n[245977.278756] BUG: desreferencia de puntero NULL del kernel, dirección: 0000000000000000\n[245977.278774] RIP: 0010:_find_first_bit+0x19/0x40\n[245977.278796] Traza de Llamada:\n[245977.278809] ? ice_misc_intr+0x364/0x380 [ice]\n\nEsto puede ocurrir si una interrupción de marca de tiempo Tx compite con la lógica de reinicio del controlador.\n\nSolucione esto verificando solo el mapa de bits in_use (y otros campos) si el rastreador está marcado como inicializado. El flujo de reinicio borrará el campo init bajo bloqueo antes de desmantelar el rastreador, evitando así cualquier uso después de liberación o acceso NULL."
    }
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}