{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-74636",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74636",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-22T15:32:16.026Z",
    "updatedAt": "2026-08-22T15:32:16.026Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "tracing: Fix race between update_event_fields and, event_define_fields",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix race between update_event_fields and, event_define_fields\n\nThe following sequence may leads race between event_define_fields()\nand update_event_fields():\n\n CPU0 (loads module A)                      CPU1 (loads module B)\n ===============================            ===============================\n load_module(A)                             load_module(B)\n   notifier_call_chain                        notifier_call_chain\n     trace_module_notify                        trace_module_notify\n       mutex_lock(&event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(&trace_event_sem)\n            __register_event(call_A)\n              __add_event_to_tracers(call_A)\n                event_define_fields(call_A)\n                  for each f:                         list_for_each_entry(field,\n                    list_add(&f->link,                                    &class->fields, link)\n                             &class->fields)            field = class->fields->next;\n\nWhere access to the class->fields is not protected by the event_mutex in\ntrace_event_update_all().\n\nThis produces the following panic:\n   Unable to handle kernel access ... at virtual address 0000000000000018\n   pc : update_event_fields+0xf8/0x368\n   Call trace:\n    update_event_fields+0xf8/0x368\n    trace_event_update_all+0x7c/0x2b4\n    trace_module_notify+0x4c/0x1dc\n    notifier_call_chain+0x84/0x168\n    blocking_notifier_call_chain_robust+0x64/0xd4\n    load_module+0x10c8/0x123c\n    __arm64_sys_finit_module+0x230/0x31c\n\nFix by taking event_mutex in trace_event_update_all() before\ntrace_event_sem.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "7c6bd60999f32138e3b73fd97ea11ef47a94de25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4e39f7b4d9d36508c53e89e6cbc640728df870b5"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a30d421468300b1e7b2f233136aeb2db8013f555"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e5f1d301b4bdaa4206db251fdc691f623162b0a8"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fdeb190b0905a6aaed1e5d6adfb8613214748d7d"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ed49684e69f846bf50b5050651ccdb87cfd152c0"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f128740f39ab28d1f4ad5bdd10f3e117eec0c374"
            },
            {
              "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c3730b8373bb5059d735509b9e6a00d7eb337d7c"
            },
            {
              "version": "55defdf935fab9f2989a197aae1042c082d9a343",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "0c53a5c80e6e286733381a1d9f255ba4039e2e45",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.15.33",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.216"
            },
            {
              "version": "5.16.19",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.17"
            },
            {
              "version": "5.17.2",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.18"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.18"
            },
            {
              "version": "5.15.216",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.183",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.152",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.104",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}