coresight: ete: Always save state on power down

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80623
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:46 UTC
Updated2026-08-28 08:16:46 UTC
DescriptionIn 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

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.060860000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 35e1c9163e025855f23a68f2470c471509e5d779 65d87f28daec31903fc39fee0744f7a0059c19f2 git Not specified
CNA Linux Linux affected 35e1c9163e025855f23a68f2470c471509e5d779 293dacd5b6a9f1275d92ca6c4fd874e54b2c8319 git Not specified
CNA Linux Linux affected 35e1c9163e025855f23a68f2470c471509e5d779 2ab4645fe4206c142a5f1491e191c906279686cf git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/65d87f28daec31903fc39fee0744f7a0059c19f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ab4645fe4206c142a5f1491e191c906279686cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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