CVE-2025-40359

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> perf/x86/intel: Fix KASAN global-out-of-bounds warning<br /> <br /> When running "perf mem record" command on CWF, the below KASAN<br /> global-out-of-bounds warning is seen.<br /> <br /> ==================================================================<br /> BUG: KASAN: global-out-of-bounds in cmt_latency_data+0x176/0x1b0<br /> Read of size 4 at addr ffffffffb721d000 by task dtlb/9850<br /> <br /> Call Trace:<br /> <br /> kasan_report+0xb8/0xf0<br /> cmt_latency_data+0x176/0x1b0<br /> setup_arch_pebs_sample_data+0xf49/0x2560<br /> intel_pmu_drain_arch_pebs+0x577/0xb00<br /> handle_pmi_common+0x6c4/0xc80<br /> <br /> The issue is caused by below code in __grt_latency_data(). The code<br /> tries to access x86_hybrid_pmu structure which doesn&amp;#39;t exist on<br /> non-hybrid platform like CWF.<br /> <br /> WARN_ON_ONCE(hybrid_pmu(event-&gt;pmu)-&gt;pmu_type == hybrid_big)<br /> <br /> So add is_hybrid() check before calling this WARN_ON_ONCE to fix the<br /> global-out-of-bounds access issue.