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GHSA-83QV-JR76-P4XC

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

s390/pai: Handle multiple PMU stop callback invocations

Handle the following scenario: The kernel protects itself against a very high sampling load and throttles the sampling using:

perf_event_throttle() --> PMU->stop()

Shortly later the scheduler may terminate the task and removes it from the CPU. It again calls

PMU->stop()

which results in two invocations of PMU->stop() called back to back. Protect against this and check the PERF_HES_STOPPED bit on function entry. If it is already set return. Clear bit PERF_HES_STOPPED in PMU->start().

Prohibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) call for this event. It sets perf_event::event_limit to a positive value and causes perf_event_overflow() to invoke pai_stop() call back function when perf_event::event_limit hits zero. This is not supported because the sample events CRYPTO_ALL and NNPA_ALL are only taken at schedule out of a task.

Use list_for_each_entry_safe() for safe iteration over syswide_list in pai_have_samples().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99125"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pai: Handle multiple PMU stop callback invocations\n\nHandle the following scenario:\nThe kernel protects itself against a very high sampling load and\nthrottles the sampling using:\n\n  perf_event_throttle() --\u003e PMU-\u003estop()\n\nShortly later the scheduler may terminate the task and removes it from the\nCPU. It again calls\n\n  PMU-\u003estop()\n\nwhich results in two invocations of PMU-\u003estop() called back to back.\nProtect against this and check the PERF_HES_STOPPED bit on function\nentry.  If it is already set return.\nClear bit PERF_HES_STOPPED in PMU-\u003estart().\n\nProhibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) call for this event.\nIt sets perf_event::event_limit to a positive value and causes\nperf_event_overflow() to invoke pai_stop() call back function when\nperf_event::event_limit hits zero. This is not supported because the\nsample events CRYPTO_ALL and NNPA_ALL are only taken at schedule out\nof a task.\n\nUse list_for_each_entry_safe() for safe iteration over syswide_list\nin pai_have_samples().",
  "id": "GHSA-83qv-jr76-p4xc",
  "modified": "2026-10-28T12:31:04Z",
  "published": "2026-10-28T12:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99125"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf348ec613f75b9774291e47b804fd7010835a6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99125 (GCVE-0-2026-99125)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34

Title

s390/pai: Handle multiple PMU stop callback invocations

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/pai: Handle multiple PMU stop callback invocations Handle the following scenario: The kernel protects itself against a very high sampling load and throttles the sampling using: perf_event_throttle() --> PMU->stop() Shortly later the scheduler may terminate the task and removes it from the CPU. It again calls PMU->stop() which results in two invocations of PMU->stop() called back to back. Protect against this and check the PERF_HES_STOPPED bit on function entry. If it is already set return. Clear bit PERF_HES_STOPPED in PMU->start(). Prohibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) call for this event. It sets perf_event::event_limit to a positive value and causes perf_event_overflow() to invoke pai_stop() call back function when perf_event::event_limit hits zero. This is not supported because the sample events CRYPTO_ALL and NNPA_ALL are only taken at schedule out of a task. Use list_for_each_entry_safe() for safe iteration over syswide_list in pai_have_samples().

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/cf348ec613f75b977…
https://git.kernel.org/stable/c/f3110e969ad226ffb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9f66572f2889a5e72a9d7e17787e52f03b1f7bd8 , < cf348ec613f75b9774291e47b804fd7010835a6c (git) Affected: 9f66572f2889a5e72a9d7e17787e52f03b1f7bd8 , < f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40 (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 7.2.13 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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          "programFiles": [
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              "lessThan": "f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40",
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            },
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              "version": "7.3",
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    "dateReserved": "2026-09-25T10:25:14.393Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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