CVE-2026-98748
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.
Affected versions
Linux kernel versions
5.13
and later are affected. Fixed in
6.12.113,
6.18.56,
7.2.10,
7.3
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-98748?
CVE-2026-98748 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.13 onward and has been patched in 6.12.113, 6.18.56, 7.2.10 and others. CVE-2026-98748 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98748?
Yes. CVE-2026-98748 has been patched. Fixed versions include 6.12.113, 6.18.56, 7.2.10 and others. If you are running Linux kernel 5.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98748 actively exploited?
No. CVE-2026-98748 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.