coresight: perf: Retrieve path and source from event data

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Summary

CVECVE-2026-97499
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:27 UTC
Updated2026-09-28 06:16:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: coresight: perf: Retrieve path and source from event data ETM perf callbacks currently use the per-CPU csdev_src pointer, which can race with updates during device registration and unregistration. The AUX setup already builds and stores the path in the event data. Use this path to retrieve the source instead of csdev_src to avoid the race. Export coresight_get_source() and add etm_event_get_ctxt_path() to retrieve the context's path and its source with READ_ONCE() / WRITE_ONCE() accessors. Give the comments to explain why this approach is safe when pause or resume callbacks preempt the disable callback (e.g. via NMI).

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.040140000 (date 2026-09-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0bcbf2e30ff2271b54f54c8697a185f7d86ec6e4 0f4cb08f30011b7625a4fba668fa5c36da5e6637 git Not specified
CNA Linux Linux affected 0bcbf2e30ff2271b54f54c8697a185f7d86ec6e4 f37bc31447c0ddafedb25e3c4a4f4e2284034247 git Not specified
CNA Linux Linux affected 4.6 Not specified
CNA Linux Linux unaffected 4.6 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0f4cb08f30011b7625a4fba668fa5c36da5e6637 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f37bc31447c0ddafedb25e3c4a4f4e2284034247 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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