net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()

{
  "id": "3fd1f4abce63ac543f26cce269115da4aba70fcd2f51439c51391a754c5bc5c8",
  "url": "https://osv.dev/vulnerability/CVE-2026-63857",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit() The transmit loop in airoha_dev_xmit() reads fragment address and length during its final iteration, when the loop index equals skb_shinfo(skb)->nr_frags, at which point the fragment data is uninitialized. While these values are never consumed, the read itself is unsafe and may trigger a page fault. Fix this by avoiding the fragment read on the last iteration. Additionally, move the skb pointer from the first to the last used packet descriptor, so that airoha_qdma_tx_napi_poll() defers freeing the skb until the final descriptor is processed.",
    "evidence": "osv:CVE-2026-63857",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-63857",
      "aliases": [
        "CVE-2026-63857"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "23020f04932701d5c8363e60756f12b43b8ed752"
                },
                {
                  "fixed": "dba5f4959653e4c212beb746594952e8645d1115"
                },
                {
                  "fixed": "f670fa4b19ceddc6d215dda4997888ccba9bbc61"
                },
                {
                  "fixed": "d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3"
                },
                {
                  "fixed": "bde34e84edc8b5571fbde7e941e175a4293ee1eb"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63857.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.12.114"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63857.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.314273846Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/bde34e84edc8b5571fbde7e941e175a4293ee1eb",
        "https://git.kernel.org/stable/c/d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3",
        "https://git.kernel.org/stable/c/dba5f4959653e4c212beb746594952e8645d1115",
        "https://git.kernel.org/stable/c/f670fa4b19ceddc6d215dda4997888ccba9bbc61",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63857.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63857",
        "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/2026/63xxx/CVE-2026-63857.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63857",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522317,
  "published_at": "2026-07-19T14:04:46.339+00:00"
}