CVE-2026-31395 (GCVE-0-2026-31395)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-04-03 15:15
VLAI?
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).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8 (git)
Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < b7c7a275447c6d4bf4a36a134682e2e4e20efd4b (git)
Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c",
            "drivers/net/ethernet/broadcom/bnxt/bnxt.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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            },
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              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0-rc5",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
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                  "vulnerable": true
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                  "versionEndExcluding": "7.0-rc5",
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u0027type\u0027 field\ndirectly as an index into bp-\u003ebs_trace[] without bounds validation.\n\nThe \u0027type\u0027 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-\u003emagic_byte\nand writes to bs_trace-\u003elast_offset and bs_trace-\u003ewrapped, 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)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-03T15:15:59.590Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3"
        }
      ],
      "title": "bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler",
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        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31395",
    "datePublished": "2026-04-03T15:15:59.590Z",
    "dateReserved": "2026-03-09T15:48:24.085Z",
    "dateUpdated": "2026-04-03T15:15:59.590Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31395\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T16:16:37.743\",\"lastModified\":\"2026-04-07T13:20:55.200\",\"vulnStatus\":\"Awaiting Analysis\",\"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 \u0027type\u0027 field\\ndirectly as an index into bp-\u003ebs_trace[] without bounds validation.\\n\\nThe \u0027type\u0027 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-\u003emagic_byte\\nand writes to bs_trace-\u003elast_offset and bs_trace-\u003ewrapped, 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).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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