CVE-2026-80626 (GCVE-0-2026-80626)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a11106544f33c104706ae42d27219a409b67478e , < c0c7722308c5f303117d8bd555290fdf26b098da (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < 67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28 (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < 9a515e00b00132b6fc3f1dd62dc5204bbda8cb10 (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < 5397142d60aa29dcf636f5459d960bfc4f97c42a (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < b89477077c834d94381c7bf07d81193bebefcff9 (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < 73711688479df333acc134e3730fff1acba1843e (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < b504fd953664c3f4d176ae8cb594adb3fda9d577 (git)
Affected: a11106544f33c104706ae42d27219a409b67478e , < 81e3a86030462824a67d697739cf3f387f4ba350 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
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        "dateUpdated": "2026-08-28T06:48:44.182Z",
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        "shortName": "Linux"
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    "datePublished": "2026-08-28T06:48:44.182Z",
    "dateReserved": "2026-08-26T14:34:25.775Z",
    "dateUpdated": "2026-08-28T06:48:44.182Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T06:59:33+00:00",
      "cve": "CVE-2026-80626",
      "id": "CVE-2026-80626",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80626.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.