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CVE-2026-31395

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler The ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in bnxt_async_event_process() uses a firmware-supplied 'type' field directly as an index into bp->bs_trace[] without bounds validation. The 'type' field is a 16-bit value extracted from DMA-mapped completion ring memory that the NIC writes directly to host RAM. A malicious or compromised NIC can supply any value from 0 to 65535, causing an out-of-bounds access into kernel heap memory. The bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte and writes to bs_trace->last_offset and bs_trace->wrapped, leading to kernel memory corruption or a crash. Fix by adding a bounds check and defining BNXT_TRACE_MAX as DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently defined firmware trace types (0x0 through 0xc).

Severity
HIGH
CVSS score
7.1 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-03 16:16:37.743000
Last modified
2026-11-05 22:18:28.453000
View original CVE JSON 
{
  "id": "CVE-2026-31395",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-04-03T16:16:37.743",
  "lastModified": "2026-11-05T22:18:28.453",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler\n\nThe ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in\nbnxt_async_event_process() uses a firmware-supplied 'type' field\ndirectly as an index into bp->bs_trace[] without bounds validation.\n\nThe 'type' field is a 16-bit value extracted from DMA-mapped completion\nring memory that the NIC writes directly to host RAM. A malicious or\ncompromised NIC can supply any value from 0 to 65535, causing an\nout-of-bounds access into kernel heap memory.\n\nThe bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte\nand writes to bs_trace->last_offset and bs_trace->wrapped, leading to\nkernel memory corruption or a crash.\n\nFix by adding a bounds check and defining BNXT_TRACE_MAX as\nDBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently\ndefined firmware trace types (0x0 through 0xc)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbnxt_en: corrección de acceso fuera de límites en el gestor de eventos asíncronos DBG_BUF_PRODUCER\n\nEl gestor ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER en bnxt_async_event_process() utiliza un campo 'type' proporcionado por el firmware directamente como un índice en bp -> bs_trace[] sin validación de límites.\n\nEl campo 'type' es un valor de 16 bits extraído de la memoria del anillo de finalización mapeada por DMA que la NIC escribe directamente en la RAM del host. Una NIC maliciosa o comprometida puede proporcionar cualquier valor de 0 a 65535, causando un acceso fuera de límites en la memoria del heap del kernel.\n\nLa llamada a bnxt_bs_trace_check_wrap() luego desreferencia bs_trace -> magic_byte y escribe en bs_trace -> last_offset y bs_trace -> wrapped, lo que lleva a corrupción de memoria del kernel o a un fallo.\n\nSolución mediante la adición de una comprobación de límites y la definición de BNXT_TRACE_MAX como DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 para cubrir todos los tipos de traza de firmware actualmente definidos (de 0x0 a 0xc)."
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            "drivers/net/ethernet/broadcom/bnxt/bnxt.h"
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              "versionType": "original_commit_for_fix",
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          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
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          "role": "CISA Coordinator",
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "lang": "en",
          "value": "CWE-125"
        }
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}