CVE-2026-98748 (GCVE-0-2026-98748)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-30 12:39
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
Version: 41a469482de257ea8db43cf74b6311bd055de030
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_bcm7271: fix use-after-free in brcmuart_remove()\n\nbrcmuart_handle_irq() starts priv-\u003ehrt to work around a receive-timeout\nquirk of the 8250 core when hardware flow control is enabled; the timer\ncallback brcmuart_hrtimer_func() dereferences priv.\n\nbrcmuart_remove() cancels the hrtimer before it unregisters the port, so\na receive-timeout interrupt that arrives in between re-arms the timer.\nAfter devm frees priv, the callback runs on freed memory.\n\nUnregister the port before cancelling the hrtimer.\nserial8250_unregister_port() shuts the port down and frees its IRQ, so\nbrcmuart_handle_irq() can no longer restart the timer, and the final\nhrtimer_cancel() drains any timer that was armed before or during the\nunregister.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:18.369Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76"
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        {
          "url": "https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e"
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        {
          "url": "https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e"
        }
      ],
      "title": "serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98748",
    "datePublished": "2026-10-18T15:47:33.446Z",
    "dateReserved": "2026-09-25T10:25:14.367Z",
    "dateUpdated": "2026-10-30T12:39:18.369Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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