Vulnerability Description
In 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.
References
- https://git.kernel.org/stable/c/3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7
- https://git.kernel.org/stable/c/3eb08f09bfb364051f51316da873c3bd51a839ef
- https://git.kernel.org/stable/c/d4002e954c612dfc7e3fb5549e4a188ea281fe35
- https://git.kernel.org/stable/c/e76b36b4be7160eaa14b416681e548b125702395
- https://git.kernel.org/stable/c/f5f0028764de322a3d04eda0d3b6389ca9847446
FAQ
What is CVE-2026-99187?
CVE-2026-99187 is a documented vulnerability. In 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_...
How severe is CVE-2026-99187?
CVSS scoring is not yet available for CVE-2026-99187. Check NVD for updates.
Is there a patch for CVE-2026-99187?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.