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.