SB20261022356 - Use-after-free in Linux kernel serial 8250 driver

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Main Vulnerability Database SB20261022356

SB20261022356 - Use-after-free in Linux kernel serial 8250 driver

Published: October 22, 2026

Security Bulletin ID SB20261022356
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98748)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to potentially cause a denial of service through access to freed kernel memory.

The vulnerability exists due to use-after-free in the Linux kernel's 8250_bcm7271 serial driver when port removal races with a receive-timeout interrupt while hardware flow control is enabled. A local privileged user can potentially exploit this race to re-arm a timer after its cancellation, causing brcmuart_hrtimer_func() to dereference freed private data and potentially crash the kernel.


Remediation

Install update from vendor's website.

References