CVE-2026-46259

Estado: AnalizadaAlta (7.8)—

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

procfs: fix missing RCU protection when reading real_parent in do_task_stat()

When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to:

This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.

Detalles técnicos trazas, registros y código del informe original

  cpu 0                               cpu 1
  -----                               -----
  do_task_stat
    var = task->real_parent
                                      release_task
                                        call_rcu(delayed_put_task_struct)
    task_tgid_nr_ns(var)
      rcu_read_lock   <--- Too late to protect task->real_parent!
      task_pid_ptr    <--- UAF!
      rcu_read_unlock

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %

Vulnerabilidad local (AV:L, PR:L) sin interacción que permite acceso-use-after-free en kernel Linux, explotable para ejecución de código con privilegios elevados (I:H, C:H, A: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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-46259",
  "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": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "fefa0fcd78be465b7ad4c497fa6ec90d64194c04",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "c93a33f28f915d446eea6fb3f0e1def0b3af1982",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "1c8dc5b5517546c68ffae40b948336122bb61306",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "73ec7c96601d61d52310c659145bb06d933a0fa6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "4f9ae386861e280b7631ca252f798d25575627ee",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "dd8b13cb4ff1a4545a214ed897fdf2bc341155b6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
              "lessThan": "76149d53502cf17ef3ae454ff384551236fba867",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/proc/array.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.26",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/proc/array.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-06-03T18:16:26.987",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent\nwithout proper RCU protection, which leads to:\n\n  cpu 0                               cpu 1\n  -----                               -----\n  do_task_stat\n    var = task->real_parent\n                                      release_task\n                                        call_rcu(delayed_put_task_struct)\n    task_tgid_nr_ns(var)\n      rcu_read_lock   <--- Too late to protect task->real_parent!\n      task_pid_ptr    <--- UAF!\n      rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: corrige la falta de protección RCU al leer real_parent en do_task_stat()\n\nAl leer /proc/[pid]/stat, do_task_stat() accede a task->real_parent sin la protección RCU adecuada, lo que lleva a:\n\n  cpu 0                               cpu 1\n  -----                               -----\n  do_task_stat\n    var = task->real_parent\n                                      release_task\n                                        call_rcu(delayed_put_task_struct)\n    task_tgid_nr_ns(var)\n      rcu_read_lock   <--- ¡Demasiado tarde para proteger task->real_parent!\n      task_pid_ptr    <--- ¡UAF!\n      rcu_read_unlock\n\nEste parche utiliza task_ppid_nr_ns() en lugar de task_tgid_nr_ns() para añadir la protección RCU adecuada para acceder a task->real_parent."
    }
  ],
  "lastModified": "2026-07-22T20:10:00.127",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CEFA4799-47FB-4FB8-B0BD-07264C560EC8",
              "versionEndExcluding": "5.10.252",
              "versionStartIncluding": "2.6.26"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671",
              "versionEndExcluding": "5.15.202",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654",
              "versionEndExcluding": "6.1.165",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2",
              "versionEndExcluding": "6.6.128",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2",
              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7",
              "versionEndExcluding": "6.18.14",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092",
              "versionEndExcluding": "6.19.4",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}