Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: coresight: ete: Always save state on power down System register ETMs and ETE are unlikely to be preserved on CPU power down. The ETE DT binding also never documented "arm,coresight-loses-context-with-cpu" so nobody would have legitimately been able to use that binding to fix it and ACPI has no such binding at all. Fix it by hard coding the setting for sysreg ETMs (ETE is always sysreg) or ACPI boots. Use a local variable when setting up save_state so that it's immune to concurrent probing when devices have different configurations which is an issue with modifying the global. This fixes the following error when using Coresight with ACPI on the FVP which supports CPU PM: coresight ete0: External agent took claim tag WARNING: drivers/hwtracing/coresight/coresight-core.c:248 at coresight_disclaim_device_unlocked+0xe0/0xe8, CPU#0: perf/117
References
- https://git.kernel.org/stable/c/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319
- https://git.kernel.org/stable/c/2ab4645fe4206c142a5f1491e191c906279686cf
- https://git.kernel.org/stable/c/65d87f28daec31903fc39fee0744f7a0059c19f2
FAQ
What is CVE-2026-80623?
CVE-2026-80623 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: coresight: ete: Always save state on power down System register ETMs and ETE are unlikely to be preserved on CPU power down. The E...
How severe is CVE-2026-80623?
CVSS scoring is not yet available for CVE-2026-80623. Check NVD for updates.
Is there a patch for CVE-2026-80623?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.