perf: Fix perf_pmu_migrate_context() leaving events behind

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99187
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:39 UTC
Updated2026-10-30 13:21:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf: Fix perf_pmu_migrate_context() leaving events behind __perf_pmu_remove() walks the group leaders of a CPU and PMU with perf_event_groups_for_cpu_pmu(), removing each one as it goes. perf_remove_from_context() takes the leader out of the groups rbtree, after which rb_next() on that node returns NULL, prematurely ending the walk. Other groups stay behind in the source context. On CPU hotplug, they are then torn down with the dying CPU. They keep running until teardown, while the PMU's interrupt and migrated events are on a new CPU, which drivers rely on never happening. Walk ctx->event_list instead and pick out the PMU's events by their pmu_ctx.

Risk And Classification

EPSS: 0.001740000 probability, percentile 0.068700000 (date 2026-11-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd27568117664b8b3e259721393df420ed51f57b 3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7 git Not specified
CNA Linux Linux affected bd27568117664b8b3e259721393df420ed51f57b d4002e954c612dfc7e3fb5549e4a188ea281fe35 git Not specified
CNA Linux Linux affected bd27568117664b8b3e259721393df420ed51f57b 3eb08f09bfb364051f51316da873c3bd51a839ef git Not specified
CNA Linux Linux affected bd27568117664b8b3e259721393df420ed51f57b f5f0028764de322a3d04eda0d3b6389ca9847446 git Not specified
CNA Linux Linux affected bd27568117664b8b3e259721393df420ed51f57b e76b36b4be7160eaa14b416681e548b125702395 git Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3eb08f09bfb364051f51316da873c3bd51a839ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e76b36b4be7160eaa14b416681e548b125702395 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5f0028764de322a3d04eda0d3b6389ca9847446 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d4002e954c612dfc7e3fb5549e4a188ea281fe35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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