Linux kernel perf __perf_event_overflow() race condition
CVE-2026-23271 is a race condition in the Linux kernel perf subsystem. According to the provided description, __perf_event_overflow() was not guaranteed to run with IRQs disabled on all possible call paths; in particular, software events could invoke it with only preemption disabled. This created a race window against perf_remove_from_context(), perf_event_exit_event(), and related teardown paths, which could free objects that the overflow handling path still expected to be valid, including associated BPF program state. The issue was resolved by ensuring __perf_event_overflow() executes with IRQs disabled for all relevant call chains.
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Cross-references every affected SKU, including bundled OEM variants.
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