GHSA-QFQ9-8C5M-346X

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31
VLAI
Details

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

eventfs: Fix use-after-free in eventfs_remove_rec()

eventfs_remove_rec() recursively removes the child at the current loop position. After the recursive call returns, list_for_each_entry() advances by reading list.next from the removed child.

If free_ei() drops the final reference, release_ei() reuses the list/rcu union to queue an SRCU callback. The child may be freed before that read. The eventfs_mutex serializes list updates, but it does not keep the removed child alive or prevent the SRCU callback from running.

Use list_for_each_entry_safe() to save the next sibling before recursively removing the current child.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74606"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:33Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Fix use-after-free in eventfs_remove_rec()\n\neventfs_remove_rec() recursively removes the child at the current loop\nposition. After the recursive call returns, list_for_each_entry() advances\nby reading list.next from the removed child.\n\nIf free_ei() drops the final reference, release_ei() reuses the list/rcu\nunion to queue an SRCU callback. The child may be freed before that read.\nThe eventfs_mutex serializes list updates, but it does not keep the removed\nchild alive or prevent the SRCU callback from running.\n\nUse list_for_each_entry_safe() to save the next sibling before recursively\nremoving the current child.",
  "id": "GHSA-qfq9-8c5m-346x",
  "modified": "2026-08-25T06:31:22Z",
  "published": "2026-08-22T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74606"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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