GHSA-RW9R-WQX2-72F7

Vulnerability from github – Published: 2024-06-25 15:31 – Updated: 2025-09-17 18:31
VLAI
Details

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

bonding: fix oops during rmmod

"rmmod bonding" causes an oops ever since commit cc317ea3d927 ("bonding: remove redundant NULL check in debugfs function"). Here are the relevant functions being called:

bonding_exit() bond_destroy_debugfs() debugfs_remove_recursive(bonding_debug_root); bonding_debug_root = NULL; <--------- SET TO NULL HERE bond_netlink_fini() rtnl_link_unregister() __rtnl_link_unregister() unregister_netdevice_many_notify() bond_uninit() bond_debug_unregister() (commit removed check for bonding_debug_root == NULL) debugfs_remove() simple_recursive_removal() down_write() -> OOPS

However, reverting the bad commit does not solve the problem completely because the original code contains a race that could cause the same oops, although it was much less likely to be triggered unintentionally:

CPU1 rmmod bonding bonding_exit() bond_destroy_debugfs() debugfs_remove_recursive(bonding_debug_root);

CPU2 echo -bond0 > /sys/class/net/bonding_masters bond_uninit() bond_debug_unregister() if (!bonding_debug_root)

CPU1 bonding_debug_root = NULL;

So do NOT revert the bad commit (since the removed checks were racy anyway), and instead change the order of actions taken during module removal. The same oops can also happen if there is an error during module init, so apply the same fix there.

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-39296"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-25T15:15:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: fix oops during rmmod\n\n\"rmmod bonding\" causes an oops ever since commit cc317ea3d927 (\"bonding:\nremove redundant NULL check in debugfs function\").  Here are the relevant\nfunctions being called:\n\nbonding_exit()\n  bond_destroy_debugfs()\n    debugfs_remove_recursive(bonding_debug_root);\n    bonding_debug_root = NULL; \u003c--------- SET TO NULL HERE\n  bond_netlink_fini()\n    rtnl_link_unregister()\n      __rtnl_link_unregister()\n        unregister_netdevice_many_notify()\n          bond_uninit()\n            bond_debug_unregister()\n              (commit removed check for bonding_debug_root == NULL)\n              debugfs_remove()\n              simple_recursive_removal()\n                down_write() -\u003e OOPS\n\nHowever, reverting the bad commit does not solve the problem completely\nbecause the original code contains a race that could cause the same\noops, although it was much less likely to be triggered unintentionally:\n\nCPU1\n  rmmod bonding\n    bonding_exit()\n      bond_destroy_debugfs()\n        debugfs_remove_recursive(bonding_debug_root);\n\nCPU2\n  echo -bond0 \u003e /sys/class/net/bonding_masters\n    bond_uninit()\n      bond_debug_unregister()\n        if (!bonding_debug_root)\n\nCPU1\n        bonding_debug_root = NULL;\n\nSo do NOT revert the bad commit (since the removed checks were racy\nanyway), and instead change the order of actions taken during module\nremoval.  The same oops can also happen if there is an error during\nmodule init, so apply the same fix there.",
  "id": "GHSA-rw9r-wqx2-72f7",
  "modified": "2025-09-17T18:31:15Z",
  "published": "2024-06-25T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39296"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a45835a0bb6ef7d5ddbc0714dd760de979cb6ece"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf48aee81103ca06d09d73d33fb72f1191069aa6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f07224c16678a8af54ddc059b3d2d51885d7f35e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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