ghsa-pwxf-vp8f-f327
Vulnerability from github
Published
2025-03-27 15:31
Modified
2025-07-06 12:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

btrfs: fix use-after-free on inode when scanning root during em shrinking

At btrfs_scan_root() we are accessing the inode's root (and fs_info) in a call to btrfs_fs_closing() after we have scheduled the inode for a delayed iput, and that can result in a use-after-free on the inode in case the cleaner kthread does the iput before we dereference the inode in the call to btrfs_fs_closing().

Fix this by using the fs_info stored already in a local variable instead of doing inode->root->fs_info.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21879"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-27T15:15:55Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free on inode when scanning root during em shrinking\n\nAt btrfs_scan_root() we are accessing the inode\u0027s root (and fs_info) in a\ncall to btrfs_fs_closing() after we have scheduled the inode for a delayed\niput, and that can result in a use-after-free on the inode in case the\ncleaner kthread does the iput before we dereference the inode in the call\nto btrfs_fs_closing().\n\nFix this by using the fs_info stored already in a local variable instead\nof doing inode-\u003eroot-\u003efs_info.",
  "id": "GHSA-pwxf-vp8f-f327",
  "modified": "2025-07-06T12:30:24Z",
  "published": "2025-03-27T15:31:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21879"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07836bc18f4ae42da4e922244f4685561c18755e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59f37036bb7ab3d554c24abc856aabca01126414"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e79d26014f9386387575b9ed60d342057cee49b"
    }
  ],
  "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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