CVE-2026-46129

Estado: En análisisAlta (7.8)—

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

btrfs: fix double free in create_space_info() error path

When kobject_init_and_add() fails, the call chain is:

create_space_info() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&space_info->kobj) -> space_info_release() -> kfree(space_info)

Then control returns to create_space_info():

btrfs_sysfs_add_space_info_type() returns error -> goto out_free -> kfree(space_info)

This causes a double free.

Keep the direct kfree(space_info) for the earlier failure path, but after btrfs_sysfs_add_space_info_type() has called kobject_put(), let the kobject release callback handle the cleanup.

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: 5/10/2026

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 de double free (CWE-415) en kernel Linux accesible con privilegios locales (PR:L). Permite ejecutar código arbitrario o causar DoS elevando permisos.

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

CWE-415

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-46129",
  "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": "20e8f2de3688082eeafeb93c8900485b7542457e",
              "lessThan": "ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "58208907c4044a764dbd8896026283905da6d9be",
              "lessThan": "c2670ec4aa49ca226bce9776601e0da37502be07",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bb4fa4c0b54aae25e55faeda7f78d0c11b8cd618",
              "lessThan": "f414b3abbba59ef379a2b3c31f2bdd9358ed5e53",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6cb008f1bb23e023dfe615cca5df14570dfc8da5",
              "lessThan": "9a060970fd7b5e1c561e4ce73cb9949e4269a738",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a11224a016d6d1d46a4d9b6573244448a80d4d7f",
              "lessThan": "dd6ade0fdd59218d71a981ae7c937a304e49209c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a11224a016d6d1d46a4d9b6573244448a80d4d7f",
              "lessThan": "3f487be81292702a59ea9dbc4088b3360a50e837",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.1.162",
              "lessThan": "6.1.175",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.122",
              "lessThan": "6.6.140",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.67",
              "lessThan": "6.12.88",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.18.7",
              "lessThan": "6.18.30",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/btrfs/space-info.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/space-info.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-28T10:16:28.473",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3f487be81292702a59ea9dbc4088b3360a50e837",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9a060970fd7b5e1c561e4ce73cb9949e4269a738",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c2670ec4aa49ca226bce9776601e0da37502be07",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dd6ade0fdd59218d71a981ae7c937a304e49209c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f414b3abbba59ef379a2b3c31f2bdd9358ed5e53",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double free in create_space_info() error path\n\nWhen kobject_init_and_add() fails, the call chain is:\n\ncreate_space_info()\n-> btrfs_sysfs_add_space_info_type()\n-> kobject_init_and_add()\n-> failure\n-> kobject_put(&space_info->kobj)\n-> space_info_release()\n-> kfree(space_info)\n\nThen control returns to create_space_info():\n\nbtrfs_sysfs_add_space_info_type() returns error\n-> goto out_free\n-> kfree(space_info)\n\nThis causes a double free.\n\nKeep the direct kfree(space_info) for the earlier failure path, but\nafter btrfs_sysfs_add_space_info_type() has called kobject_put(), let\nthe kobject release callback handle the cleanup."
    }
  ],
  "lastModified": "2026-06-24T18:10:24.650",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "75727B5C-E260-40C6-ADB0-FE828902A5F7",
              "versionEndExcluding": "6.1.175",
              "versionStartIncluding": "6.1.162"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "511A93EB-D844-497A-8507-71BFE095FA06",
              "versionEndExcluding": "6.6.140",
              "versionStartIncluding": "6.6.122"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "251D1B2E-2F27-4042-84E8-B5A01A75AB74",
              "versionEndExcluding": "6.12.88",
              "versionStartIncluding": "6.12.67"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "76CFFF82-D317-4BEA-807B-C59EA6680E3B",
              "versionEndExcluding": "6.18.30",
              "versionStartIncluding": "6.18.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E4CB01CB-3218-4920-91CF-A5FFFFFF60C3",
              "versionEndExcluding": "7.0.7",
              "versionStartIncluding": "6.19.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "35C8A871-4971-433E-A046-FC9F7B7D190A"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}