{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: fix oops when split header is enabled\n\nFor GMAC4, when split header is enabled, in some rare cases, the\nhardware does not fill buf2 of the first descriptor with payload.\nThus we cannot assume buf2 is always fully filled if it is not\nthe last descriptor. Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not."
    }
  ],
  "id": "CVE-2026-45940",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:10.193",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-45940"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: fix oops when split header is enabled\n\nFor GMAC4, when split header is enabled, in some rare cases, the\nhardware does not fill buf2 of the first descriptor with payload.\nThus we cannot assume buf2 is always fully filled if it is not\nthe last descriptor. Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not.",
  "id": "GHSA-fr2g-jcmh-j266",
  "modified": "2026-05-27T15:33:17Z",
  "published": "2026-05-27T15:33:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45940"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-45940 net: stmmac: fix oops when split header is enabled - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45940.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "net: stmmac: fix oops when split header is enabled",
    "tracking": {
      "current_release_date": "2026-05-29T01:44:35.000Z",
      "generator": {
        "date": "2026-05-29T07:23:45.792Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-45940",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-28T01:06:13.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-05-28T14:48:52.000Z",
          "legacy_version": "1.1",
          "number": "2",
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        },
        {
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          "legacy_version": "2",
          "number": "3",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.139.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-45940",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45940 net: stmmac: fix oops when split header is enabled - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45940.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-28T01:06:13.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "net: stmmac: fix oops when split header is enabled"
    }
  ]
}