CVE-2025-38322

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+0xf9/0x210

CPUs 16-23 are E-core CPUs that dont support the perf metrics feature. The icl_update_topdown_event() should not be invoked on these CPUs.

Its 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() function is mistakenly used to replace the is_topdown_count() call to check if the topdown functions for the perf metrics feature should be invoked.

Fix it.

Affected Software

References

• https://git.kernel.org/stable/c/a85cc69acdcb05f8cd226b8ea0778b8e2e887e6f
• https://git.kernel.org/stable/c/b0823d5fbacb1c551d793cbfe7af24e0d1fa45ed