perf/x86: Fix NULL event access and potential PEBS record loss

{
  "id": "f84d584bc7fe4e123eab3b8ff1258a5ecb14183694302bb7718eb7bcce8d257b",
  "url": "https://osv.dev/vulnerability/CVE-2025-68375",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "perf/x86: Fix NULL event access and potential PEBS record loss",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: perf/x86: Fix NULL event access and potential PEBS record loss When intel_pmu_drain_pebs_icl() is called to drain PEBS records, the perf_event_overflow() could be called to process the last PEBS record. While perf_event_overflow() could trigger the interrupt throttle and stop all events of the group, like what the below call-chain shows. perf_event_overflow() -> __perf_event_overflow() ->__perf_event_account_interrupt() -> perf_event_throttle_group() -> perf_event_throttle() -> event->pmu->stop() -> x86_pmu_stop() The side effect of stopping the events is that all corresponding event pointers in cpuc->events[] array are cleared to NULL. Assume there are two PEBS events (event a and event b) in a group. When intel_pmu_drain_pebs_icl() calls perf_event_overflow() to process the last PEBS record of PEBS event a, interrupt throttle is triggered and all pointers of event a and event b are cleared to NULL. Then intel_pmu_drain_pebs_icl() tries to process the last PEBS record of event b and encounters NULL pointer access. To avoid this issue, move cpuc->events[] clearing from x86_pmu_stop() to x86_pmu_del(). It's safe since cpuc->active_mask or cpuc->pebs_enabled is always checked before access the event pointer from cpuc->events[].",
    "evidence": "osv:CVE-2025-68375",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.17.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-68375",
      "aliases": [
        "CVE-2025-68375"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9734e25fbf5ae68eb04234b2cd14a4b36ab89141"
                },
                {
                  "fixed": "cf69b99805c263117305ac6dffbc85aaf9259d32"
                },
                {
                  "fixed": "6b089028bff1f2ff9e0c62b8f1faca1a620e5d6e"
                },
                {
                  "fixed": "7e772a93eb61cb6265bdd1c5bde17d0f2718b452"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68375.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.17.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68375.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.340143986Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6b089028bff1f2ff9e0c62b8f1faca1a620e5d6e",
        "https://git.kernel.org/stable/c/7e772a93eb61cb6265bdd1c5bde17d0f2718b452",
        "https://git.kernel.org/stable/c/cf69b99805c263117305ac6dffbc85aaf9259d32",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68375.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68375",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68375.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-68375",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492674,
  "published_at": "2025-12-24T10:33:04.819+00:00"
}