CVE-2026-98008 (GCVE-0-2026-98008)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
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: 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. 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 831e19e565b5210930fa183730071f8290c61263
Version: 81db1e52848694761a1aa162ce76198af9964ed8
Version: d0c3601f2c4e12e7689b0f46ebc17525250ea8c3
Version: d0c3601f2c4e12e7689b0f46ebc17525250ea8c3
Version: d0c3601f2c4e12e7689b0f46ebc17525250ea8c3
Version: d0c3601f2c4e12e7689b0f46ebc17525250ea8c3
Version: cafa5942bd2df3d80e3eeb2deb4bc050f7761f3d
Version: c81dcaa9cd0b66816c2ecb6c5df0b6afde9c7da5
Version: 19088c5378c9fea54e552d8bc7418a3aa1e06990
Version: 6.1.114   ≤
Version: 6.6.58   ≤
Version: 5.10.228   ≤
Version: 5.15.169   ≤
Version: 6.11.5   ≤
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{
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          "defaultStatus": "unaffected",
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            "drivers/net/ethernet/cadence/macb_main.c"
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      "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-\u003emii_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-\u003emii_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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:13.751Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3"
        },
        {
          "url": "https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a"
        }
      ],
      "title": "net: macb: fix NULL pointer dereference on unbind with fixed-link",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98008",
    "datePublished": "2026-09-25T10:23:33.532Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-10-19T09:12:13.751Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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