GHSA-3FR6-PGC4-QMRV

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2026-05-12 15:31
VLAI
Details

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

NFS: Fix a race when updating an existing write

After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_request() from succeeding until we actually lock the page group. The reason is that whoever called nfs_inode_remove_request() doesn't necessarily have a lock on the page group head.

So in order to avoid races, let's take the page group lock earlier in nfs_lock_and_join_requests(), and hold it across the removal of the request in nfs_inode_remove_request().

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-2025-39697"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-05T18:15:46Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a race when updating an existing write\n\nAfter nfs_lock_and_join_requests() tests for whether the request is\nstill attached to the mapping, nothing prevents a call to\nnfs_inode_remove_request() from succeeding until we actually lock the\npage group.\nThe reason is that whoever called nfs_inode_remove_request() doesn\u0027t\nnecessarily have a lock on the page group head.\n\nSo in order to avoid races, let\u0027s take the page group lock earlier in\nnfs_lock_and_join_requests(), and hold it across the removal of the\nrequest in nfs_inode_remove_request().",
  "id": "GHSA-3fr6-pgc4-qmrv",
  "modified": "2026-05-12T15:31:03Z",
  "published": "2025-09-05T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39697"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c32e3c71aaa1c1ba05da88605e2ddd493c58794f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f230d40147cc37eb3aef4d50e2e2c06ea73d9a77"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "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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