GHSA-XJWH-3RM6-W25H

Vulnerability from github – Published: 2024-09-02 18:31 – Updated: 2025-11-04 00:31
VLAI
Details

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

fuse: Initialize beyond-EOF page contents before setting uptodate

fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents).

So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate.

The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap().

This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2024-44947"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-665"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-02T18:15:36Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: Initialize beyond-EOF page contents before setting uptodate\n\nfuse_notify_store(), unlike fuse_do_readpage(), does not enable page\nzeroing (because it can be used to change partial page contents).\n\nSo fuse_notify_store() must be more careful to fully initialize page\ncontents (including parts of the page that are beyond end-of-file)\nbefore marking the page uptodate.\n\nThe current code can leave beyond-EOF page contents uninitialized, which\nmakes these uninitialized page contents visible to userspace via mmap().\n\nThis is an information leak, but only affects systems which do not\nenable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the\ncorresponding kernel command line parameter).",
  "id": "GHSA-xjwh-3rm6-w25h",
  "modified": "2025-11-04T00:31:19Z",
  "published": "2024-09-02T18:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44947"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49934861514d36d0995be8e81bb3312a499d8d9a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://project-zero.issues.chromium.org/issues/42451729"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}


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