serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()

{
  "id": "97fa20e80effb25b37783bdcb201b97a5f4314c363432ab5b5621eef760747ab",
  "url": "https://osv.dev/vulnerability/CVE-2026-98748",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: serial: 8250_bcm7271: fix use-after-free in brcmuart_remove() brcmuart_handle_irq() starts priv->hrt to work around a receive-timeout quirk of the 8250 core when hardware flow control is enabled; the timer callback brcmuart_hrtimer_func() dereferences priv. brcmuart_remove() cancels the hrtimer before it unregisters the port, so a receive-timeout interrupt that arrives in between re-arms the timer. After devm frees priv, the callback runs on freed memory. Unregister the port before cancelling the hrtimer. serial8250_unregister_port() shuts the port down and frees its IRQ, so brcmuart_handle_irq() can no longer restart the timer, and the final hrtimer_cancel() drains any timer that was armed before or during the unregister. This issue was found by an in-house static analysis tool.",
    "evidence": "osv:CVE-2026-98748",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
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            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
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            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98748",
      "aliases": [
        "CVE-2026-98748"
      ],
      "affected": [
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                  "fixed": "0794ba5332754866b2f1c0cca668775be3ffcf0a"
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                  "fixed": "189b9dc8c96ec9486482f27c1372b04a7152175e"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98748.json"
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        {
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              "type": "ECOSYSTEM",
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            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98748.json"
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      ],
      "modified": "2026-11-01T02:30:47.095713197Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a",
        "https://git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8",
        "https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e",
        "https://git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889",
        "https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76",
        "https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc",
        "https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98748.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98748",
        "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/2026/98xxx/CVE-2026-98748.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-98748",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508169,
  "published_at": "2026-10-18T15:47:33.446+00:00"
}