bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler

{
  "id": "b7a02a04363e6a3027269b19137e1b4b602f6a6e9d61022abf1c44f01833667a",
  "url": "https://osv.dev/vulnerability/CVE-2026-31395",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler",
    "summary": "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).",
    "evidence": "osv:CVE-2026-31395",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.20",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-31395",
      "aliases": [
        "CVE-2026-31395"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9"
                },
                {
                  "fixed": "19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8"
                },
                {
                  "fixed": "b7c7a275447c6d4bf4a36a134682e2e4e20efd4b"
                },
                {
                  "fixed": "64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31395.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.20"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31395.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.026382915Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8",
        "https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3",
        "https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31395.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31395",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31395.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31395",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504046,
  "published_at": "2026-04-03T15:15:59.59+00:00"
}