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CVE-2025-68245

Estado: AplazadaSin puntuar—

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

net: netpoll: fix incorrect refcount handling causing incorrect cleanup

commit efa95b01da18 ("netpoll: fix use after free") incorrectly ignored the refcount and prematurely set dev->npinfo to NULL during netpoll cleanup, leading to improper behavior and memory leaks.

Scenario causing lack of proper cleanup:

Revert commit efa95b01da18 ("netpoll: fix use after free") and adds clarifying comments emphasizing that npinfo cleanup should only happen once the refcount reaches zero, ensuring stable and correct netpoll behavior.

Detalles técnicos trazas, registros y código del informe original
1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is
   allocated, and refcnt = 1
   - Keep in mind that npinfo is shared among all netpoll instances. In
     this case, there is just one.

2) Another netpoll is also associated with the same NIC and
   npinfo->refcnt += 1.
   - Now dev->npinfo->refcnt = 2;
   - There is just one npinfo associated to the netdev.

3) When the first netpolls goes to clean up:
   - The first cleanup succeeds and clears np->dev->npinfo, ignoring
     refcnt.
     - It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);`
   - Set dev->npinfo = NULL, without proper cleanup
   - No ->ndo_netpoll_cleanup() is either called

4) Now the second target tries to clean up
   - The second cleanup fails because np->dev->npinfo is already NULL.
     * In this case, ops->ndo_netpoll_cleanup() was never called, and
       the skb pool is not cleaned as well (for the second netpoll
       instance)
  - This leaks npinfo and skbpool skbs, which is clearly reported by
    kmemleak.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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).

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)

Mostrar
{
  "id": "CVE-2025-68245",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
              "lessThan": "8e6a50edad11e3e1426e4c29e7aa6201f3468ac2",
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          "defaultStatus": "unaffected"
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        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
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              "version": "3.17"
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            {
              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.4.302",
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            },
            {
              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "5.15.197",
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            },
            {
              "status": "unaffected",
              "version": "6.1.159",
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            },
            {
              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.17.9",
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            },
            {
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/core/netpoll.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-16T15:15:53.767",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/49c8d2c1f94cc2f4d1a108530d7ba52614b874c2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/4afd4ebbad52aa146838ec23082ba393e426a2bb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/890472d6fbf062e6de7fdd56642cb305ab79d669",
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    {
      "url": "https://git.kernel.org/stable/c/8e6a50edad11e3e1426e4c29e7aa6201f3468ac2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/9b0bb18b4b9dc017c1825a2c5e763615e34a1593",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/c645693180a98606c430825223d2029315d85e9d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c79a6d9da29219616b118a3adce9a14cd30f9bd0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: netpoll: fix incorrect refcount handling causing incorrect cleanup\n\ncommit efa95b01da18 (\"netpoll: fix use after free\") incorrectly\nignored the refcount and prematurely set dev->npinfo to NULL during\nnetpoll cleanup, leading to improper behavior and memory leaks.\n\nScenario causing lack of proper cleanup:\n\n1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is\n   allocated, and refcnt = 1\n   - Keep in mind that npinfo is shared among all netpoll instances. In\n     this case, there is just one.\n\n2) Another netpoll is also associated with the same NIC and\n   npinfo->refcnt += 1.\n   - Now dev->npinfo->refcnt = 2;\n   - There is just one npinfo associated to the netdev.\n\n3) When the first netpolls goes to clean up:\n   - The first cleanup succeeds and clears np->dev->npinfo, ignoring\n     refcnt.\n     - It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);`\n   - Set dev->npinfo = NULL, without proper cleanup\n   - No ->ndo_netpoll_cleanup() is either called\n\n4) Now the second target tries to clean up\n   - The second cleanup fails because np->dev->npinfo is already NULL.\n     * In this case, ops->ndo_netpoll_cleanup() was never called, and\n       the skb pool is not cleaned as well (for the second netpoll\n       instance)\n  - This leaks npinfo and skbpool skbs, which is clearly reported by\n    kmemleak.\n\nRevert commit efa95b01da18 (\"netpoll: fix use after free\") and adds\nclarifying comments emphasizing that npinfo cleanup should only happen\nonce the refcount reaches zero, ensuring stable and correct netpoll\nbehavior."
    }
  ],
  "lastModified": "2026-06-17T09:58:47.977",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}