{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "eff95e170275d9e80b968f335cd03d0ac250d2d1"
            },
            {
              "fixed": "7fa9a465ae8f07c0e4685db6edb6a6f984dbd784"
            },
            {
              "fixed": "88aed0422f39b22406f35f1e758cea25e7bbcfb5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98268.json"
  },
  "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't 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": "CVE-2026-98268",
  "modified": "2026-10-07T02:30:50.519992771Z",
  "published": "2026-10-06T08:45:30.917Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fa9a465ae8f07c0e4685db6edb6a6f984dbd784"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88aed0422f39b22406f35f1e758cea25e7bbcfb5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98268.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98268"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "perf: Fix null pointer access in is_include_guest_event()"
}