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CVE-2026-98008

Estado: RecibidaSin puntuar—

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

net: macb: fix NULL pointer dereference on unbind with fixed-link

When the device tree describes a fixed-link and has no "mdio" child node, macb_mii_init() returns early without allocating the MDIO bus, leaving bp->mii_bus as NULL.

Two cleanup paths then dereference this NULL bus:

mdiobus_unregister() and mdiobus_free() do not guard against a NULL bus, so guard the calls in both macb_remove() and the probe error path.

Detalles técnicos trazas, registros y código del informe original
1. On driver unbind, macb_remove() unconditionally calls
   mdiobus_unregister(bp->mii_bus), which oopses:

  Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8
  pc : mdiobus_unregister+0x14/0xa4
  lr : macb_remove+0x38/0xa4
  Call trace:
   mdiobus_unregister+0x14/0xa4 (P)
   macb_remove+0x38/0xa4
   platform_remove+0x20/0x30
   device_release_driver_internal+0x1c8/0x224
   unbind_store+0xb4/0xbc

2. On the probe error path in macb_probe(), reached when
   macb_mii_init() has succeeded but a subsequent step fails, the
   err_out_unregister_mdio label runs the same unconditional cleanup.

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-2026-98008",
  "cveTags": [],
  "metrics": {},
  "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": "831e19e565b5210930fa183730071f8290c61263",
              "lessThan": "afa224cabc0132ca414b9141b1a919ca2d318cd0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "81db1e52848694761a1aa162ce76198af9964ed8",
              "lessThan": "054ad8e66025eb4778d840bef80c270646cebcd2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d0c3601f2c4e12e7689b0f46ebc17525250ea8c3",
              "lessThan": "f737d999fcb8f276d77b01ea4c2016ee01dad19b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d0c3601f2c4e12e7689b0f46ebc17525250ea8c3",
              "lessThan": "5710f6a74f63cbba0e15cd75917234916181c9d4",
              "versionType": "git"
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            {
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            {
              "status": "affected",
              "version": "6.1.114",
              "lessThan": "6.1.189",
              "versionType": "semver"
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            {
              "status": "affected",
              "version": "6.6.58",
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              "versionType": "semver"
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            {
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              "version": "5.10.228",
              "lessThan": "5.11",
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            {
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              "version": "5.15.169",
              "lessThan": "5.16",
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            },
            {
              "status": "affected",
              "version": "6.11.5",
              "lessThan": "6.12",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/cadence/macb_main.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.12",
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            },
            {
              "status": "unaffected",
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              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/cadence/macb_main.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:29.080",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix NULL pointer dereference on unbind with fixed-link\n\nWhen the device tree describes a fixed-link and has no \"mdio\" child\nnode, macb_mii_init() returns early without allocating the MDIO bus,\nleaving bp->mii_bus as NULL.\n\nTwo cleanup paths then dereference this NULL bus:\n\n1. On driver unbind, macb_remove() unconditionally calls\n   mdiobus_unregister(bp->mii_bus), which oopses:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8\n  pc : mdiobus_unregister+0x14/0xa4\n  lr : macb_remove+0x38/0xa4\n  Call trace:\n   mdiobus_unregister+0x14/0xa4 (P)\n   macb_remove+0x38/0xa4\n   platform_remove+0x20/0x30\n   device_release_driver_internal+0x1c8/0x224\n   unbind_store+0xb4/0xbc\n\n2. On the probe error path in macb_probe(), reached when\n   macb_mii_init() has succeeded but a subsequent step fails, the\n   err_out_unregister_mdio label runs the same unconditional cleanup.\n\nmdiobus_unregister() and mdiobus_free() do not guard against a NULL\nbus, so guard the calls in both macb_remove() and the probe error\npath."
    }
  ],
  "lastModified": "2026-10-03T11:18:23.743",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}