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CVE-2025-38322

Description

In the Linux kernel, the following vulnerability has been resolved:perf/x86/intel: Fix crash in icl_update_topdown_event()The perf_fuzzer found a hard-lockup crash on a RaptorLake machine: Oops: general protection fault, maybe for address 0xffff89aeceab400: 0000 CPU: 23 UID: 0 PID: 0 Comm: swapper/23 Tainted: [W]=WARN Hardware name: Dell Inc. Precision 9660/0VJ762 RIP: 0010:native_read_pmc+0x7/0x40 Code: cc e8 8d a9 01 00 48 89 03 5b cd cc cc cc cc 0f 1f ... RSP: 000:fffb03100273de8 EFLAGS: 00010046 .... Call Trace: icl_update_topdown_event+0x165/0x190 ? ktime_get+0x38/0xd0 intel_pmu_read_event+0xf9/0x210 __perf_event_read+0xf9/0x210CPUs 16-23 are E-core CPUs that don't support the perf metrics feature.The icl_update_topdown_event() should not be invoked on these CPUs.It's a regression of commit: f9bdf1f95339 ("perf/x86/intel: Avoid disable PMU if !cpuc->enabled in sample read")The bug introduced by that commit is that the is_topdown_event() functionis mistakenly used to replace the is_topdown_count() call to check if thetopdown functions for the perf metrics feature should be invoked.Fix it.

POC

Reference

No PoCs from references.

Github

- https://github.com/w4zu/Debian_security