CVE-2025-38322

/// Technical 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:

<TASK>

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 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_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References