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GHSA-47G9-QXGV-4Q29

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31

Details

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

perf: Fix null pointer access in is_include_guest_event()

A typical module unload occurring event when there is an active perf connection leads to freeing of the pmu pointer. The call log is something like: .. __pmu_detach_event pmu_detach_event pmu_detach_events perf_pmu_unregister ..

__pmu_detach_event() sets event->pmu to null. When the perf connection finally is closed, the following stack trace is observed:

Oops: general protection fault, kernel NULL pointer dereference ... RIP: 0010:_free_event+0x3e/0x370 ... Call Trace: ... perf_event_release_kernel+0x260/0x2d0 perf_release+0x12/0x20

A call to mediated_pmu_unaccount_event() inside _free_event() is the root cause of this crash. Adding a check inside is_include_guest_event() ensures we don't accidentally access a null pmu ptr. In addition to this, we will now call mediated_pmu_unaccount_event() before clearing the pmu ptr so that nr_include_guest_events counts are maintained correctly.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98268"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix null pointer access in is_include_guest_event()\n\nA typical module unload occurring event when there is an active perf\nconnection leads to freeing of the pmu pointer. The call log is something\nlike:\n ..\n __pmu_detach_event\n pmu_detach_event\n pmu_detach_events\n perf_pmu_unregister\n ..\n\n__pmu_detach_event() sets event-\u003epmu to null. When the perf connection\nfinally is closed, the following stack trace is observed:\n\n Oops: general protection fault, kernel NULL pointer dereference\n ...\n RIP: 0010:_free_event+0x3e/0x370\n ...\n Call Trace:\n ...\n perf_event_release_kernel+0x260/0x2d0\n perf_release+0x12/0x20\n\nA call to mediated_pmu_unaccount_event() inside _free_event() is the root\ncause of this crash. Adding a check inside is_include_guest_event() ensures\nwe don\u0027t accidentally access a null pmu ptr. In addition to this, we will\nnow call mediated_pmu_unaccount_event() before clearing the pmu ptr so that\nnr_include_guest_events counts are maintained correctly.",
  "id": "GHSA-47g9-qxgv-4q29",
  "modified": "2026-10-06T09:31:32Z",
  "published": "2026-10-06T09:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98268"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fa9a465ae8f07c0e4685db6edb6a6f984dbd784"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88aed0422f39b22406f35f1e758cea25e7bbcfb5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98268 (GCVE-0-2026-98268)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45

Title

perf: Fix null pointer access in is_include_guest_event()

Summary

In the Linux kernel, the following vulnerability has been resolved: perf: Fix null pointer access in is_include_guest_event() A typical module unload occurring event when there is an active perf connection leads to freeing of the pmu pointer. The call log is something like: .. __pmu_detach_event pmu_detach_event pmu_detach_events perf_pmu_unregister .. __pmu_detach_event() sets event->pmu to null. When the perf connection finally is closed, the following stack trace is observed: Oops: general protection fault, kernel NULL pointer dereference ... RIP: 0010:_free_event+0x3e/0x370 ... Call Trace: ... perf_event_release_kernel+0x260/0x2d0 perf_release+0x12/0x20 A call to mediated_pmu_unaccount_event() inside _free_event() is the root cause of this crash. Adding a check inside is_include_guest_event() ensures we don't accidentally access a null pmu ptr. In addition to this, we will now call mediated_pmu_unaccount_event() before clearing the pmu ptr so that nr_include_guest_events counts are maintained correctly.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6619 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/7fa9a465ae8f07c0e…
https://git.kernel.org/stable/c/88aed0422f39b2240…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: eff95e170275d9e80b968f335cd03d0ac250d2d1 , < 7fa9a465ae8f07c0e4685db6edb6a6f984dbd784 (git) Affected: eff95e170275d9e80b968f335cd03d0ac250d2d1 , < 88aed0422f39b22406f35f1e758cea25e7bbcfb5 (git)
Linux	Linux	Affected: 7.0 Unaffected: 0 , < 7.0 (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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            },
            {
              "lessThan": "88aed0422f39b22406f35f1e758cea25e7bbcfb5",
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              "versionType": "git"
            }
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        },
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
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                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3-rc4",
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                  "vulnerable": true
                }
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            }
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        }
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix null pointer access in is_include_guest_event()\n\nA typical module unload occurring event when there is an active perf\nconnection leads to freeing of the pmu pointer. The call log is something\nlike:\n ..\n __pmu_detach_event\n pmu_detach_event\n pmu_detach_events\n perf_pmu_unregister\n ..\n\n__pmu_detach_event() sets event-\u003epmu to null. When the perf connection\nfinally is closed, the following stack trace is observed:\n\n Oops: general protection fault, kernel NULL pointer dereference\n ...\n RIP: 0010:_free_event+0x3e/0x370\n ...\n Call Trace:\n ...\n perf_event_release_kernel+0x260/0x2d0\n perf_release+0x12/0x20\n\nA call to mediated_pmu_unaccount_event() inside _free_event() is the root\ncause of this crash. Adding a check inside is_include_guest_event() ensures\nwe don\u0027t accidentally access a null pmu ptr. In addition to this, we will\nnow call mediated_pmu_unaccount_event() before clearing the pmu ptr so that\nnr_include_guest_events counts are maintained correctly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:45:30.917Z",
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98268",
    "datePublished": "2026-10-06T08:45:30.917Z",
    "dateReserved": "2026-09-25T10:25:14.333Z",
    "dateUpdated": "2026-10-06T08:45:30.917Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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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