CVE-2025-21739

Estado: ModificadaAlta (7.8)—

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

scsi: ufs: core: Fix use-after free in init error and remove paths

devm_blk_crypto_profile_init() registers a cleanup handler to run when the associated (platform-) device is being released. For UFS, the crypto private data and pointers are stored as part of the ufs_hba's data structure 'struct ufs_hba::crypto_profile'. This structure is allocated as part of the underlying ufshcd and therefore Scsi_host allocation.

During driver release or during error handling in ufshcd_pltfrm_init(), this structure is released as part of ufshcd_dealloc_host() before the (platform-) device associated with the crypto call above is released.

Leer descripción completaMostrar menos

Once this device is released, the crypto cleanup code will run, using the just-released 'struct ufs_hba::crypto_profile'. This causes a use-after-free situation:

In other words, the initialisation code flow is:

and during error handling of ufshcd_pltfrm_init() or during driver removal:

To fix this use-after free, change ufshcd_alloc_host() to register a devres action to automatically cleanup the underlying SCSI device on ufshcd destruction, without requiring explicit calls to ufshcd_dealloc_host(). This way:

Detalles técnicos trazas, registros y código del informe original

  Call trace:
   kfree+0x60/0x2d8 (P)
   kvfree+0x44/0x60
   blk_crypto_profile_destroy_callback+0x28/0x70
   devm_action_release+0x1c/0x30
   release_nodes+0x6c/0x108
   devres_release_all+0x98/0x100
   device_unbind_cleanup+0x20/0x70
   really_probe+0x218/0x2d0

  platform-device probe
    ufshcd_pltfrm_init()
      ufshcd_alloc_host()
        scsi_host_alloc()
          allocation of struct ufs_hba
          creation of scsi-host devices
    devm_blk_crypto_profile_init()
      devm registration of cleanup handler using platform-device

  ufshcd_dealloc_host()
    scsi_host_put()
      put_device(scsi-host)
        release of struct ufs_hba
  put_device(platform-device)
    crypto cleanup handler

    * the crypto profile and all other ufs_hba-owned resources are
      destroyed before SCSI (as they've been registered after)
    * a memleak is plugged in tc-dwc-g210-pci.c remove() as a
      side-effect
    * EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) can be removed fully as
      it's not needed anymore
    * no future drivers using ufshcd_alloc_host() could ever forget
      adding 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: 0.22%
Percentil entre todas las CVEs puntuadas: 12
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 Interpreterexecution70 %
Impacto secundarioT1499.004 Application or System Exploitationimpact60 %

CVE-2025-21739 es una use-after-free (CWE-416) en el kernel Linux con acceso local (AV:L) y privilegios bajos (PR:L) que permite escalada de privilegios. El atacante puede corromper memoria del kernel y ejecutar código con privilegios de kernel, según CVSS CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:

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 Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-21739",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-21739",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-02-27T18:14:30.354249Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "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": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "0a6895c03b1f439236e2d22b1a69ebfc1eb9d5ea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "d06eb2620d3bf16056b8b7ea3744dbb5e30512f4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "0dc539b888fb5f56b6eeddd95433eab557d4b0c1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "0c77c0d754fe83cb154715fcfec6c3faef94f207",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "9c185beae09a3eb85f54777edafa227f7e03075d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350",
              "lessThan": "f8fb2403ddebb5eea0033d90d9daae4c88749ada",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/ufs/core/ufshcd.c",
            "drivers/ufs/host/ufshcd-pci.c",
            "drivers/ufs/host/ufshcd-pltfrm.c",
            "include/ufs/ufshcd.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.135",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.14",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/ufs/core/ufshcd.c",
            "drivers/ufs/host/ufshcd-pci.c",
            "drivers/ufs/host/ufshcd-pltfrm.c",
            "include/ufs/ufshcd.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-27T03:15:14.530",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0a6895c03b1f439236e2d22b1a69ebfc1eb9d5ea",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0c77c0d754fe83cb154715fcfec6c3faef94f207",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0dc539b888fb5f56b6eeddd95433eab557d4b0c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c185beae09a3eb85f54777edafa227f7e03075d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d06eb2620d3bf16056b8b7ea3744dbb5e30512f4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f8fb2403ddebb5eea0033d90d9daae4c88749ada",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Fix use-after free in init error and remove paths\n\ndevm_blk_crypto_profile_init() registers a cleanup handler to run when\nthe associated (platform-) device is being released. For UFS, the\ncrypto private data and pointers are stored as part of the ufs_hba's\ndata structure 'struct ufs_hba::crypto_profile'. This structure is\nallocated as part of the underlying ufshcd and therefore Scsi_host\nallocation.\n\nDuring driver release or during error handling in ufshcd_pltfrm_init(),\nthis structure is released as part of ufshcd_dealloc_host() before the\n(platform-) device associated with the crypto call above is released.\nOnce this device is released, the crypto cleanup code will run, using\nthe just-released 'struct ufs_hba::crypto_profile'. This causes a\nuse-after-free situation:\n\n  Call trace:\n   kfree+0x60/0x2d8 (P)\n   kvfree+0x44/0x60\n   blk_crypto_profile_destroy_callback+0x28/0x70\n   devm_action_release+0x1c/0x30\n   release_nodes+0x6c/0x108\n   devres_release_all+0x98/0x100\n   device_unbind_cleanup+0x20/0x70\n   really_probe+0x218/0x2d0\n\nIn other words, the initialisation code flow is:\n\n  platform-device probe\n    ufshcd_pltfrm_init()\n      ufshcd_alloc_host()\n        scsi_host_alloc()\n          allocation of struct ufs_hba\n          creation of scsi-host devices\n    devm_blk_crypto_profile_init()\n      devm registration of cleanup handler using platform-device\n\nand during error handling of ufshcd_pltfrm_init() or during driver\nremoval:\n\n  ufshcd_dealloc_host()\n    scsi_host_put()\n      put_device(scsi-host)\n        release of struct ufs_hba\n  put_device(platform-device)\n    crypto cleanup handler\n\nTo fix this use-after free, change ufshcd_alloc_host() to register a\ndevres action to automatically cleanup the underlying SCSI device on\nufshcd destruction, without requiring explicit calls to\nufshcd_dealloc_host(). This way:\n\n    * the crypto profile and all other ufs_hba-owned resources are\n      destroyed before SCSI (as they've been registered after)\n    * a memleak is plugged in tc-dwc-g210-pci.c remove() as a\n      side-effect\n    * EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) can be removed fully as\n      it's not needed anymore\n    * no future drivers using ufshcd_alloc_host() could ever forget\n      adding the cleanup"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: ufs: core: Fix use-after free in init error and remove paths devm_blk_crypto_profile_init() registra un controlador de depuración para ejecutarse cuando se libera el dispositivo (de plataforma) asociado. Para UFS, los datos privados de cifrado y los punteros se almacenan como parte de la estructura de datos de ufs_hba 'struct ufs_hba::crypto_profile'. Esta estructura se asigna como parte de la asignación subyacente de ufshcd y, por lo tanto, de Scsi_host. Durante el lanzamiento del controlador o durante la gestión de errores en ufshcd_pltfrm_init(), esta estructura se libera como parte de ufshcd_dealloc_host() antes de que se libere el dispositivo (de plataforma) asociado con la llamada criptográfica anterior. Una vez que se libera este dispositivo, se ejecutará el código de depuración criptográfica, utilizando el 'struct ufs_hba::crypto_profile' recién publicado. Esto provoca una situación de use after free: Call trace: kfree+0x60/0x2d8 (P) kvfree+0x44/0x60 blk_crypto_profile_destroy_callback+0x28/0x70 devm_action_release+0x1c/0x30 release_nodes+0x6c/0x108 devres_release_all+0x98/0x100 device_unbind_cleanup+0x20/0x70 really_probe+0x218/0x2d0 In other words, the initialisation code flow is: platform-device probe ufshcd_pltfrm_init() ufshcd_alloc_host() scsi_host_alloc() allocation of struct ufs_hba creation of scsi-host devices devm_blk_crypto_profile_init() devm registration of cleanup handler using platform-device and during error handling of ufshcd_pltfrm_init() or during driver removal: ufshcd_dealloc_host() scsi_host_put() put_device(scsi-host) release of struct ufs_hba put_device(platform-device) crypto cleanup handler To fix this use-after free, change ufshcd_alloc_host() para registrar una acción devres para limpiar automáticamente el dispositivo SCSI subyacente en la destrucción de ufshcd, sin requerir llamadas explícitas a ufshcd_dealloc_host(). De esta manera: * el perfil criptográfico y todos los demás recursos propiedad de ufs_hba se destruyen antes de SCSI (ya que se registraron después) * se conecta una fuga de memoria en tc-dwc-g210-pci.c remove() como efecto secundario * EXPORT_SYMBOL_GPL(ufshcd_dealloc_host) se puede eliminar por completo ya que ya no es necesario * ningún controlador futuro que use ufshcd_alloc_host() podría olvidarse de agregar la depuración "
    }
  ],
  "lastModified": "2026-06-17T08:44:09.783",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "03E58B14-5ED8-473D-BB8E-CB847D6B7FC1",
              "versionEndExcluding": "6.12.14",
              "versionStartIncluding": "5.12"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0E92CEE3-1FC3-4AFC-A513-DEDBA7414F00",
              "versionEndExcluding": "6.13.3",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}