GHSA-38QW-V9Q4-HM9J

Vulnerability from github – Published: 2024-08-22 06:30 – Updated: 2024-08-23 03:30
VLAI
Details

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

configfs: fix a race in configfs_{,un}register_subsystem()

When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic.

One of cases is: A --> B --> C --> D A <-- B <-- C <-- D

 delete list_head *B        |      delete list_head *C

--------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next

Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.

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-2022-48931"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-22T04:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix a race in configfs_{,un}register_subsystem()\n\nWhen configfs_register_subsystem() or configfs_unregister_subsystem()\nis executing link_group() or unlink_group(),\nit is possible that two processes add or delete list concurrently.\nSome unfortunate interleavings of them can cause kernel panic.\n\nOne of cases is:\nA --\u003e B --\u003e C --\u003e D\nA \u003c-- B \u003c-- C \u003c-- D\n\n     delete list_head *B        |      delete list_head *C\n--------------------------------|-----------------------------------\nconfigfs_unregister_subsystem   |   configfs_unregister_subsystem\n  unlink_group                  |     unlink_group\n    unlink_obj                  |       unlink_obj\n      list_del_init             |         list_del_init\n        __list_del_entry        |           __list_del_entry\n          __list_del            |             __list_del\n            // next == C        |\n            next-\u003eprev = prev   |\n                                |               next-\u003eprev = prev\n            prev-\u003enext = next   |\n                                |                 // prev == B\n                                |                 prev-\u003enext = next\n\nFix this by adding mutex when calling link_group() or unlink_group(),\nbut parent configfs_subsystem is NULL when config_item is root.\nSo I create a mutex configfs_subsystem_mutex.",
  "id": "GHSA-38qw-v9q4-hm9j",
  "modified": "2024-08-23T03:30:59Z",
  "published": "2024-08-22T06:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48931"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc"
    }
  ],
  "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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