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GHSA-PRJX-7CFW-RQR7

Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-05-20 15:35

Details

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

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31395"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:37Z",
    "severity": "HIGH"
  },
  "details": "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).",
  "id": "GHSA-prjx-7cfw-rqr7",
  "modified": "2026-05-20T15:35:22Z",
  "published": "2026-04-03T18:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07

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

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/19aa416eed9e4aaf1…
https://git.kernel.org/stable/c/b7c7a275447c6d4bf…
https://git.kernel.org/stable/c/64dcbde7f8f870a4f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8 (git) Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < b7c7a275447c6d4bf4a36a134682e2e4e20efd4b (git) Affected: 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 , < 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 (git)
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 , ≤ * (original_commit_for_fix)

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JSON

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          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c",
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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