CVE-2026-98748
Received
Received - Intake
Use-After-Free in Linux Kernel 8250 BCM7271 Serial Driver
Vulnerability report for CVE-2026-98748, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 41a469482de257ea8db43cf74b6311bd055de030 |
| Linux | Linux | 41a469482de257ea8db43cf74b6311bd055de030 |
| Linux | Linux | 41a469482de257ea8db43cf74b6311bd055de030 |
| Linux | Linux | 41a469482de257ea8db43cf74b6311bd055de030 |
| Linux | Linux | 5.13 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
