ghsa-6c9x-j9r2-vpw8
Vulnerability from github
Published
2025-07-04 15:31
Modified
2025-07-04 15:31
Details

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

ipc: fix to protect IPCS lookups using RCU

syzbot reported that it discovered a use-after-free vulnerability, 0

idr_for_each() is protected by rwsem, but this is not enough. If it is not protected by RCU read-critical region, when idr_for_each() calls radix_tree_node_free() through call_rcu() to free the radix_tree_node structure, the node will be freed immediately, and when reading the next node in radix_tree_for_each_slot(), the already freed memory may be read.

Therefore, we need to add code to make sure that idr_for_each() is protected within the RCU read-critical region when we call it in shm_destroy_orphaned().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38212"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-04T14:15:29Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipc: fix to protect IPCS lookups using RCU\n\nsyzbot reported that it discovered a use-after-free vulnerability, [0]\n\n[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/\n\nidr_for_each() is protected by rwsem, but this is not enough.  If it is\nnot protected by RCU read-critical region, when idr_for_each() calls\nradix_tree_node_free() through call_rcu() to free the radix_tree_node\nstructure, the node will be freed immediately, and when reading the next\nnode in radix_tree_for_each_slot(), the already freed memory may be read.\n\nTherefore, we need to add code to make sure that idr_for_each() is\nprotected within the RCU read-critical region when we call it in\nshm_destroy_orphaned().",
  "id": "GHSA-6c9x-j9r2-vpw8",
  "modified": "2025-07-04T15:31:09Z",
  "published": "2025-07-04T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38212"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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