CVE-2026-80626 (GCVE-0-2026-80626)
Vulnerability from cvelistv5
Published
2026-08-28 06:48
Modified
2026-08-28 06:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del fsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at the 'out:' label, but only calls the matching get_cpu_var() after the 'i < 0' early-return check. When event->hw.idx is negative the function jumps to 'out:' without having taken get_cpu_var(), and the trailing put_cpu_var() then issues an unmatched preempt_enable(), underflowing preempt_count. On a CONFIG_PREEMPT=y kernel preempt_count would underflow and eventually present as a 'scheduling while atomic' BUG. Move put_cpu_var() to pair with get_cpu_var() so the percpu access is correctly bracketed and the 'out:' label only handles perf_pmu_enable.
References
Impacted products
Vendor Product Version
Linux Linux Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
Version: a11106544f33c104706ae42d27219a409b67478e
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/perf: fix preempt count underflow in fsl_emb_pmu_del\n\nfsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at\nthe \u0027out:\u0027 label, but only calls the matching get_cpu_var() after the\n\u0027i \u003c 0\u0027 early-return check. When event-\u003ehw.idx is negative the\nfunction jumps to \u0027out:\u0027 without having taken get_cpu_var(), and the\ntrailing put_cpu_var() then issues an unmatched preempt_enable(),\nunderflowing preempt_count.\n\nOn a CONFIG_PREEMPT=y kernel preempt_count would underflow and\neventually present as a \u0027scheduling while atomic\u0027 BUG.\n\nMove put_cpu_var() to pair with get_cpu_var() so the percpu access is\ncorrectly bracketed and the \u0027out:\u0027 label only handles perf_pmu_enable."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:44.182Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c0c7722308c5f303117d8bd555290fdf26b098da"
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        {
          "url": "https://git.kernel.org/stable/c/67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28"
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        {
          "url": "https://git.kernel.org/stable/c/9a515e00b00132b6fc3f1dd62dc5204bbda8cb10"
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          "url": "https://git.kernel.org/stable/c/5397142d60aa29dcf636f5459d960bfc4f97c42a"
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          "url": "https://git.kernel.org/stable/c/b89477077c834d94381c7bf07d81193bebefcff9"
        },
        {
          "url": "https://git.kernel.org/stable/c/73711688479df333acc134e3730fff1acba1843e"
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        {
          "url": "https://git.kernel.org/stable/c/b504fd953664c3f4d176ae8cb594adb3fda9d577"
        },
        {
          "url": "https://git.kernel.org/stable/c/81e3a86030462824a67d697739cf3f387f4ba350"
        }
      ],
      "title": "powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80626",
    "datePublished": "2026-08-28T06:48:44.182Z",
    "dateReserved": "2026-08-26T14:34:25.775Z",
    "dateUpdated": "2026-08-28T06:48:44.182Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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