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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
bd27568117664b8b3e259721393df420ed51f57b to < 3eb08f09bfb364051f51316da873c3bd51a839efaffectedbd27568117664b8b3e259721393df420ed51f57b to < f5f0028764de322a3d04eda0d3b6389ca9847446affectedbd27568117664b8b3e259721393df420ed51f57b to < e76b36b4be7160eaa14b416681e548b125702395affected
Linux Linux
Default version status: affected
6.2affected0 to < 6.2unaffected6.18.59 to ≤ 6.18.*unaffected7.2.13 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected