CVE-2026-93819
kernel: PCI: mediatek: Protect root bus removal with rescan lock
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 24, 2026
Updated · September 29, 2026
Description
A flaw was found in the Linux kernel's MediaTek PCIe driver. The driver fails to acquire the proper lock while stopping and removing a root bus, allowing a race condition to occur alongside concurrent bus rescan or hotplug operations initiated via sysfs. A local user could exploit this race to trigger a use-after-free memory error, leading to a Denial of Service (DoS) through a system crash.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-366 · Race Condition within a Thread