GHSA-7G75-Q55X-6R4J
Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98748"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:28Z",
"severity": null
},
"details": "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.",
"id": "GHSA-7g75-q55x-6r4j",
"modified": "2026-10-30T15:33:58Z",
"published": "2026-10-18T18:32:02Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98748"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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