CVE-2026-80623

A flaw was found in the Coresight Embedded Trace Extension (ETE) component of the Linux kernel. This vulnerability arises because the system register states for Embedded Trace Macrocells (ETMs) and ETE are not consistently preserved when the CPU powers down. A local attacker could potentially trigger this condition by interacting with CPU power management, which may lead to system instability or a denial of service due to improper state handling and resource management.

A flaw of moderate severity was found in the Linux kernel's Coresight Embedded Trace Extension (ETE) support. The configuration and state of system-register ETMs and ETE are not preserved when a CPU powers down, because the ETE device-tree binding never documented a context-loss property and ACPI boots have no such mechanism at all. A local attacker able to exercise CPU power management while Coresight tracing is in use could trigger this improper state handling, resulting in kernel warnings, system instability, or a denial of service. The impact is limited to availability (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, 5.5 Moderate). All Red Hat Enterprise Linux and Red Hat In-Vehicle OS kernel and kernel-rt streams are currently listed as not affected because the vulnerable code is not present in those shipped kernels.

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.