arch/powerpc/perf/core-book3s.c in the Linux kernel before 5.12.13, on systems with perfeventparanoid=-1 and no specific PMU driver support registered, allows local users to cause a denial of service (perfinstructionpointer NULL pointer dereference and OOPS) via a "perf record" command.
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"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38200.json"