net: airoha: Fix use-after-free in metadata dst teardown

{
  "id": "2919b55c02ae2efa61b4161d84f16acf2a065f3d22f60e6b3a6f662486191547",
  "url": "https://osv.dev/vulnerability/CVE-2026-53248",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: airoha: Fix use-after-free in metadata dst teardown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: airoha: Fix use-after-free in metadata dst teardown airoha_metadata_dst_free() runs metadata_dst_free() which frees the metadata_dst with kfree() immediately, bypassing the RCU grace period. In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from the skb to the metadata_dst. This function requires RCU read-side protection and the dst must remain valid until all RCU readers complete. Since metadata_dst_free() calls kfree() directly, an use-after-free can occur if any skb still holds a noref pointer to the dst when the driver tears it down. Replace metadata_dst_free() with dst_release() which properly goes through the refcount path: when the refcount drops to zero, it schedules the actual free via call_rcu_hurry(), ensuring all RCU readers have completed before the memory is freed.",
    "evidence": "osv:CVE-2026-53248",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53248",
      "aliases": [
        "CVE-2026-53248"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "6f829e2c17a53a35321268339cd252aff6d6d723"
                },
                {
                  "fixed": "4b5a574e033e66d2131eff1c18feef8d8643c67e"
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                  "fixed": "b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53248.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.18.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.13"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53248.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.898541911Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b5a574e033e66d2131eff1c18feef8d8643c67e",
        "https://git.kernel.org/stable/c/6f829e2c17a53a35321268339cd252aff6d6d723",
        "https://git.kernel.org/stable/c/b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53248.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53248",
        "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/2026/53xxx/CVE-2026-53248.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53248",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509339,
  "published_at": "2026-06-25T08:39:41.307+00:00"
}