GHSA-73RM-R64M-JH58

Vulnerability from github – Published: 2026-07-01 15:35 – Updated: 2026-07-01 15:35
VLAI
Details

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

net: bonding: fix NULL pointer dereference in bond_do_ioctl()

In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which can return NULL if the requested interface name does not exist. However, the subsequent slave_dbg() call is placed before the NULL check:

slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here
if (!slave_dev)
    return -ENODEV;

The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ...) which unconditionally dereferences slave_dev->name before the NULL check is performed. This results in a NULL pointer dereference kernel oops when a user calls bonding ioctl (e.g. SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave interface name.

This is reachable from userspace via the bonding ioctl interface with CAP_NET_ADMIN capability, making it a potential local denial-of-service vector.

Fix by moving the slave_dbg() call after the NULL check.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53337"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-01T14:16:41Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL pointer dereference in bond_do_ioctl()\n\nIn bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which\ncan return NULL if the requested interface name does not exist. However,\nthe subsequent slave_dbg() call is placed before the NULL check:\n\n    slave_dev = __dev_get_by_name(net, ifr-\u003eifr_slave);\n    slave_dbg(bond_dev, slave_dev, \"slave_dev=%p:\\n\", slave_dev); //here\n    if (!slave_dev)\n        return -ENODEV;\n\nThe slave_dbg() macro expands to netdev_dbg(bond_dev, \"(slave %s): \" fmt,\n(slave_dev)-\u003ename, ...) which unconditionally dereferences slave_dev-\u003ename\nbefore the NULL check is performed. This results in a NULL pointer\ndereference kernel oops when a user calls bonding ioctl (e.g.\nSIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave\ninterface name.\n\nThis is reachable from userspace via the bonding ioctl interface with\nCAP_NET_ADMIN capability, making it a potential local denial-of-service\nvector.\n\nFix by moving the slave_dbg() call after the NULL check.",
  "id": "GHSA-73rm-r64m-jh58",
  "modified": "2026-07-01T15:35:19Z",
  "published": "2026-07-01T15:35:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53337"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b7558c85493467b2ea20738866b822db6442034"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66693957bacd1c9dae6188a7312d6be69a221f2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a629418d463fb50d132a1aa063b0105857311e5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a764b0e8317a863006e05732e1aefe821b9d8c2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b02b2e3e876c18733b868a29064abd11cdbf8feb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0878106ddc486375084145848ff255dedfff46a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcb8fad90f27300add583a8371db504b766d95c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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