CVE-2026-31528 perf: Make sure to use pmu_ctx->pmu for groups

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/events/core.c"
    ],
    "versions": [
      {
        "version": "bd27568117664b8b3e259721393df420ed51f57b",
        "lessThan": "656f35b463995bee024d948440128230aacd81e1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bd27568117664b8b3e259721393df420ed51f57b",
        "lessThan": "3a696e84a8b1fafdd774bb30d62919faf844d9e4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bd27568117664b8b3e259721393df420ed51f57b",
        "lessThan": "35f7914e54fe7f13654c22ee045b05e4b6d8062b",
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      },
      {
        "version": "bd27568117664b8b3e259721393df420ed51f57b",
        "lessThan": "4c759446046500a1a6785b25725725c3ff087ace",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "bd27568117664b8b3e259721393df420ed51f57b",
        "lessThan": "4b9ce671960627b2505b3f64742544ae9801df97",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/events/core.c"
    ],
    "versions": [
      {
        "version": "6.2",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.2",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.131",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.80",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.21",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.11",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]