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CVE-2025-39810

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Fix memory corruption when FW resources change during ifdown bnxt_set_dflt_rings() assumes that it is always called before any TC has been created. So it doesn't take bp->num_tc into account and assumes that it is always 0 or 1. In the FW resource or capability change scenario, the FW will return flags in bnxt_hwrm_if_change() that will cause the driver to reinitialize and call bnxt_cancel_reservations(). This will lead to bnxt_init_dflt_ring_mode() calling bnxt_set_dflt_rings() and bp->num_tc may be greater than 1. This will cause bp->tx_ring[] to be sized too small and cause memory corruption in bnxt_alloc_cp_rings(). Fix it by properly scaling the TX rings by bp->num_tc in the code paths mentioned above. Add 2 helper functions to determine bp->tx_nr_rings and bp->tx_nr_rings_per_tc.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-16 13:15:53.543000
Last modified
2026-10-30 13:18:09.857000
View original CVE JSON 
{
  "id": "CVE-2025-39810",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-16T13:15:53.543",
  "lastModified": "2026-10-30T13:18:09.857",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: Fix memory corruption when FW resources change during ifdown\n\nbnxt_set_dflt_rings() assumes that it is always called before any TC has\nbeen created.  So it doesn't take bp->num_tc into account and assumes\nthat it is always 0 or 1.\n\nIn the FW resource or capability change scenario, the FW will return\nflags in bnxt_hwrm_if_change() that will cause the driver to\nreinitialize and call bnxt_cancel_reservations().  This will lead to\nbnxt_init_dflt_ring_mode() calling bnxt_set_dflt_rings() and bp->num_tc\nmay be greater than 1.  This will cause bp->tx_ring[] to be sized too\nsmall and cause memory corruption in bnxt_alloc_cp_rings().\n\nFix it by properly scaling the TX rings by bp->num_tc in the code\npaths mentioned above.  Add 2 helper functions to determine\nbp->tx_nr_rings and bp->tx_nr_rings_per_tc."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbnxt_en: Corrige la corrupción de memoria cuando los recursos del FW cambian durante el ifdown\n\nbnxt_set_dflt_rings() asume que siempre se llama antes de que se haya creado cualquier TC. Por lo tanto, no tiene en cuenta bp->num_tc y asume que siempre es 0 o 1.\n\nEn el escenario de cambio de recursos o capacidades del FW, el FW devolverá flags en bnxt_hwrm_if_change() que harán que el controlador se reinicialice y llame a bnxt_cancel_reservations(). Esto llevará a que bnxt_init_dflt_ring_mode() llame a bnxt_set_dflt_rings() y bp->num_tc puede ser mayor que 1. Esto hará que bp->tx_ring[] tenga un tamaño demasiado pequeño y cause corrupción de memoria en bnxt_alloc_cp_rings().\n\nSe corrige escalando correctamente los anillos TX por bp->num_tc en las rutas de código mencionadas anteriormente. Se añaden 2 funciones auxiliares para determinar bp->tx_nr_rings y bp->tx_nr_rings_per_tc."
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