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
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-generic-64k-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-realtime-64kUpgrade linux-image-realtimeUpgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-generic-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-gke-7.0Upgrade linux-image-7.0.0-1014-awsUpgrade linux-image-azure-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-gke-64kUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-azureUpgrade linux-image-aws-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-generic-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-realtime-7.0Upgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-1017-azureUpgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-oracleUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcpUpgrade linux-image-awsUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-ibmUpgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-azure-lts-26.04Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-genericUpgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-azure-fde-7.0Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracle-7.0Upgrade linux-image-virtualUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-38-genericUpgrade linux-image-aws-64k-7.0Upgrade linux-image-gkeUpgrade linux-image-gcp-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1013-oracle-64k | Oct 7, 2026 | Oct 6, 2026 |
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