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CVE-2026-74753

Estado: RecibidaAlta (7.8)—

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

perf: Reject exited events as group leaders

perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events.

A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event.

Leer descripción completaMostrar menos

Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment.

[peterz: make the earlier test fully consistent]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L/PR:L) en kernel Linux que permite elevar privilegios manipulando eventos perf. Acceso local sin interacción (UI:N) → T1068. Impactos: DoS por use-after-free (A:H) y lectura de memoria kernel (C:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74753",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2",
              "lessThan": "ce12e1170c0c78dffb9b28af6d287492ae7dd99d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "39358e856fb89e62e3c8d7389a2dc4ec33dbe90e",
              "lessThan": "e593031ff19a9484e8a00bc47edd447187721846",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a2d5d3ee7b6e3953114726b1521e62123ab5b043",
              "lessThan": "7a03413f31c196ab3894f988cdce0bb47b4fec42",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06ccef0434e98058ddae7bcebc901f93d22b7653",
              "lessThan": "7ce010275c531475f9d6e7efb11b9e522c74ed2e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "037a3c43edfb597665dd34457cd22b14692f2ba3",
              "lessThan": "fa091f46c3833fb22384f10eade2b4e1e1d0b278",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/events/core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6.145",
              "lessThan": "6.6.156",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.96",
              "lessThan": "6.12.108",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.18.39",
              "lessThan": "6.18.46",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "7.1.4",
              "lessThan": "7.1.10",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "kernel/events/core.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-08-26T15:16:54.387",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7a03413f31c196ab3894f988cdce0bb47b4fec42",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ce010275c531475f9d6e7efb11b9e522c74ed2e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ce12e1170c0c78dffb9b28af6d287492ae7dd99d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e593031ff19a9484e8a00bc47edd447187721846",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fa091f46c3833fb22384f10eade2b4e1e1d0b278",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Reject exited events as group leaders\n\nperf_event_remove_on_exec() sets remove-on-exec events to the EXIT state\nand detaches their group relationships.  The event's file descriptor can\nremain open, however, and perf_event_open() currently accepts that event\nas a group leader because its early validation rejects only REVOKED and\nDEAD events.\n\nA new sibling can consequently be linked to the detached leader.  When\nthe leader is closed, perf_group_detach() observes that its\nPERF_ATTACH_GROUP bit is already clear and skips the new sibling.  The\nsibling then retains a group_leader pointer to the freed event.\n\nReject group leaders in the EXIT state.  Perform the check while holding\nthe shared context mutex so that an exec in the target task cannot detach\nthe leader between validation and group attachment.\n\n[peterz: make the earlier test fully consistent]"
    }
  ],
  "lastModified": "2026-09-02T13:18:10.493",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}