SB20260828155 - Improper control of a resource through its lifetime in Linux kernel hwtracing coresight driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-80623)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper state management in the coresight etm4x/ete power management handling when powering down CPUs while using coresight tracing. A local user can trigger CPU power management events while tracing is active to cause a denial of service.

This affects system register ETMs, ETE devices, and ACPI-based systems where trace state is not preserved across CPU power down.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319
• https://git.kernel.org/stable/c/2ab4645fe4206c142a5f1491e191c906279686cf
• https://git.kernel.org/stable/c/65d87f28daec31903fc39fee0744f7a0059c19f2