{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98008",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-98008"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "net: macb: fix NULL pointer dereference on unbind with fixed-link",
  "details": "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.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98008"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}