CVE-2026-74636 (GCVE-0-2026-74636)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-11-06 17:05
VLAI
Title
tracing: Fix race between update_event_fields and, event_define_fields
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix race between update_event_fields and, event_define_fields The following sequence may leads race between event_define_fields() and update_event_fields(): CPU0 (loads module A) CPU1 (loads module B) =============================== =============================== load_module(A) load_module(B) notifier_call_chain notifier_call_chain trace_module_notify trace_module_notify mutex_lock(&event_mutex) trace_event_update_all() trace_module_add_events(A) down_write(&trace_event_sem) __register_event(call_A) __add_event_to_tracers(call_A) event_define_fields(call_A) for each f: list_for_each_entry(field, list_add(&f->link, &class->fields, link) &class->fields) field = class->fields->next; Where access to the class->fields is not protected by the event_mutex in trace_event_update_all(). This produces the following panic: Unable to handle kernel access ... at virtual address 0000000000000018 pc : update_event_fields+0xf8/0x368 Call trace: update_event_fields+0xf8/0x368 trace_event_update_all+0x7c/0x2b4 trace_module_notify+0x4c/0x1dc notifier_call_chain+0x84/0x168 blocking_notifier_call_chain_robust+0x64/0xd4 load_module+0x10c8/0x123c __arm64_sys_finit_module+0x230/0x31c Fix by taking event_mutex in trace_event_update_all() before trace_event_sem.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 17:00 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c6bd60999f32138e3b73fd97ea11ef47a94de25 , < 4e39f7b4d9d36508c53e89e6cbc640728df870b5 (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < a30d421468300b1e7b2f233136aeb2db8013f555 (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < e5f1d301b4bdaa4206db251fdc691f623162b0a8 (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < fdeb190b0905a6aaed1e5d6adfb8613214748d7d (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < ed49684e69f846bf50b5050651ccdb87cfd152c0 (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < f128740f39ab28d1f4ad5bdd10f3e117eec0c374 (git)
Affected: b3bc8547d3be60898818885f5bf22d0a62e2eb48 , < c3730b8373bb5059d735509b9e6a00d7eb337d7c (git)
Affected: 55defdf935fab9f2989a197aae1042c082d9a343 (git)
Affected: 0c53a5c80e6e286733381a1d9f255ba4039e2e45 (git)
Affected: 5.15.33 , < 5.15.216 (semver)
Affected: 5.16.19 , < 5.17 (semver)
Affected: 5.17.2 , < 5.18 (semver)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 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\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(\u0026event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(\u0026trace_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(\u0026f-\u003elink,                                    \u0026class-\u003efields, link)\n                             \u0026class-\u003efields)            field = class-\u003efields-\u003enext;\n\nWhere access to the class-\u003efields 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."
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      "cve": "CVE-2026-74636",
      "id": "msrc_CVE-2026-74636",
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      "title": "tracing: Fix race between update_event_fields and, event_define_fields",
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            "value": "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(\u0026event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(\u0026trace_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(\u0026f-\u003elink,                                    \u0026class-\u003efields, link)\n                             \u0026class-\u003efields)            field = class-\u003efields-\u003enext;\n\nWhere access to the class-\u003efields 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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntracing: Solucionar condici\u00f3n de carrera entre update_event_fields y event_define_fields\n\nLa siguiente secuencia puede provocar una condici\u00f3n de carrera entre event_define_fields() y update_event_fields():\n\n CPU0 (carga el m\u00f3dulo A)                      CPU1 (carga el m\u00f3dulo 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(\u0026event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(\u0026trace_event_sem)\n            __register_event(call_A)\n              __add_event_to_tracers(call_A)\n                event_define_fields(call_A)\n                  para cada f:                         list_for_each_entry(field,\n                    list_add(\u0026f -\u003e link,                                    \u0026class -\u003e fields, link)\n                             \u0026class -\u003e fields)            field = class -\u003e fields -\u003e next;\n\nDonde el acceso a class -\u003e fields no est\u00e1 protegido por el event_mutex en trace_event_update_all().\n\nEsto produce el siguiente p\u00e1nico:\n   No se puede manejar el acceso al kernel ... en la direcci\u00f3n virtual 0000000000000018\n   pc : update_event_fields+0xf8/0x368\n   Rastro de llamada:\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\nSoluci\u00f3n al tomar event_mutex en trace_event_update_all() antes de trace_event_sem."
          }
        ],
        "id": "CVE-2026-74636",
        "lastModified": "2026-11-06T17:19:52.173",
        "metrics": {
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "timestamp": "2026-11-06T17:00:17.420037Z",
                "version": "2.0.3"
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        "published": "2026-08-22T16:16:36.750",
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            "url": "https://git.kernel.org/stable/c/f128740f39ab28d1f4ad5bdd10f3e117eec0c374"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fdeb190b0905a6aaed1e5d6adfb8613214748d7d"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T11:25:03+00:00",
      "cve": "CVE-2026-74636",
      "id": "CVE-2026-74636",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "122",
      "product_status:known_not_affected": "78",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Fix race between update_event_fields and, event_define_fields",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74636.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-14T02:04:51Z",
      "cve": "CVE-2026-74636",
      "id": "CVE-2026-74636",
      "initial_release_date": "2026-08-23T00:05:31Z",
      "product_status:known_affected": "577",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "340",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74636",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-74636.json",
      "version": "16"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-74636",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T17:00:17.420037Z",
                    "version": "2.0.3"
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                }
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            "providerMetadata": {
              "dateUpdated": "2026-11-06T17:00:18.483Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "kernel/trace/trace_events.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "versionType": "git"
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                  "versionType": "git"
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                {
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                  "status": "affected",
                  "version": "b3bc8547d3be60898818885f5bf22d0a62e2eb48",
                  "versionType": "git"
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                  "versionType": "semver"
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                  "versionType": "semver"
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              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.18"
                },
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                  "lessThan": "5.18",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
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                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.216",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.183",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.152",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.104",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.45",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.9",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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              "nodes": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.216",
                      "versionStartIncluding": "5.15.33",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.183",
                      "versionStartIncluding": "5.18",
                      "vulnerable": true
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                      "vulnerable": true
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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "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(\u0026event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(\u0026trace_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(\u0026f-\u003elink,                                    \u0026class-\u003efields, link)\n                             \u0026class-\u003efields)            field = class-\u003efields-\u003enext;\n\nWhere access to the class-\u003efields 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."
            }
          ],
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            "dateUpdated": "2026-08-22T15:32:16.026Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
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            },
            {
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            },
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            },
            {
              "url": "https://git.kernel.org/stable/c/c3730b8373bb5059d735509b9e6a00d7eb337d7c"
            }
          ],
          "title": "tracing: Fix race between update_event_fields and, event_define_fields",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-74636",
        "datePublished": "2026-08-22T15:32:16.026Z",
        "dateReserved": "2026-08-15T05:44:03.922Z",
        "dateUpdated": "2026-11-06T17:05:49.525Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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