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CVE-2026-89893

Estado: RecibidaAlta (7.8)—

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

media: cx23885: cancel NetUP CI work before teardown

netup_ci_exit() frees a netup_ci_state while its work item, netup_read_ci_status(), may still be pending or running on the system workqueue. The worker obtains the state with container_of() and dereferences it, so it must not outlive the state.

netup_ci_init() queues the initial status read, and CI GPIO interrupts subsequently queue the same work from netup_ci_slot_status(). During remove, cx23885_finidev() calls free_irq() before the CI device is unregistered. free_irq() prevents further IRQ handlers from running, but does not drain work queued previously, so the worker can run after netup_ci_exit() frees the state.

Leer descripción completaMostrar menos

Call cancel_work_sync() before dvb_ca_en50221_release() and kfree().

This issue was found by an in-house static analysis tool.

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 de escalada de privilegios local (AV:L, PR:L) en el kernel de Linux que permite DoS por use-after-free en manejo de trabajo pendiente. Requiere acceso local de usuario.

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

User TrainingUser Account ManagementThreat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and Sandboxing

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-2026-89893",
  "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": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "lessThan": "aaf76794b870b0f391eff339252a2e2e22f33a4a",
              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
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              "versionType": "git"
            },
            {
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              "lessThan": "5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
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              "lessThan": "4e143d662ca94888b494b2427fc9e34494eb933a",
              "versionType": "git"
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          ],
          "programFiles": [
            "drivers/media/pci/cx23885/cimax2.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "2.6.30"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.30",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/media/pci/cx23885/cimax2.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:16:58.000",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/99cd62b9b1c818d6d01a87be9a8e5796314150a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cx23885: cancel NetUP CI work before teardown\n\nnetup_ci_exit() frees a netup_ci_state while its work item,\nnetup_read_ci_status(), may still be pending or running on the system\nworkqueue. The worker obtains the state with container_of() and\ndereferences it, so it must not outlive the state.\n\nnetup_ci_init() queues the initial status read, and CI GPIO interrupts\nsubsequently queue the same work from netup_ci_slot_status(). During\nremove, cx23885_finidev() calls free_irq() before the CI device is\nunregistered. free_irq() prevents further IRQ handlers from running,\nbut does not drain work queued previously, so the worker can run after\nnetup_ci_exit() frees the state.\n\nCall cancel_work_sync() before dvb_ca_en50221_release() and kfree().\n\nThis issue was found by an in-house static analysis tool."
    }
  ],
  "lastModified": "2026-09-16T15:18:15.647",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}