GHSA-3M25-8XH3-C6P2

Vulnerability from github – Published: 2025-02-10 18:30 – Updated: 2025-10-15 18:31
VLAI?
Details

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

cachestat: fix page cache statistics permission checking

When the 'cachestat()' system call was added in commit cf264e1329fb ("cachestat: implement cachestat syscall"), it was meant to be a much more convenient (and performant) version of mincore() that didn't need mapping things into the user virtual address space in order to work.

But it ended up missing the "check for writability or ownership" fix for mincore(), done in commit 134fca9063ad ("mm/mincore.c: make mincore() more conservative").

This just adds equivalent logic to 'cachestat()', modified for the file context (rather than vma).

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-21691"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-10T16:15:38Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachestat: fix page cache statistics permission checking\n\nWhen the \u0027cachestat()\u0027 system call was added in commit cf264e1329fb\n(\"cachestat: implement cachestat syscall\"), it was meant to be a much\nmore convenient (and performant) version of mincore() that didn\u0027t need\nmapping things into the user virtual address space in order to work.\n\nBut it ended up missing the \"check for writability or ownership\" fix for\nmincore(), done in commit 134fca9063ad (\"mm/mincore.c: make mincore()\nmore conservative\").\n\nThis just adds equivalent logic to \u0027cachestat()\u0027, modified for the file\ncontext (rather than vma).",
  "id": "GHSA-3m25-8xh3-c6p2",
  "modified": "2025-10-15T18:31:48Z",
  "published": "2025-02-10T18:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21691"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f537664e705b0bf8b7e329861f20128534f6a83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/780ab8329672464984cf1344bd5c3993af0226c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d6405c13b0d8a8367cd8df63f118b619a3f0dd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97153a05077f618f7471f50a78158602badccb30"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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