ghsa-3pj9-hhgf-f53q
Vulnerability from github
Published
2025-10-24 21:31
Modified
2025-10-24 21:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()

EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.

modpost used to detect it, but it has been broken for a decade.

Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.

There are two ways to fix it:

  • Remove __init
  • Remove EXPORT_SYMBOL

I chose the latter for this case because the only in-tree call-site, arch/x86/kernel/cpu/mshyperv.c is never compiled as modular. (CONFIG_HYPERVISOR_GUEST is boolean)

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49726"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:48Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource: hyper-v: unexport __init-annotated hv_init_clocksource()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it has been broken for a decade.\n\nRecently, I fixed modpost so it started to warn it again, then this\nshowed up in linux-next builds.\n\nThere are two ways to fix it:\n\n  - Remove __init\n  - Remove EXPORT_SYMBOL\n\nI chose the latter for this case because the only in-tree call-site,\narch/x86/kernel/cpu/mshyperv.c is never compiled as modular.\n(CONFIG_HYPERVISOR_GUEST is boolean)",
  "id": "GHSA-3pj9-hhgf-f53q",
  "modified": "2025-10-24T21:31:09Z",
  "published": "2025-10-24T21:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49726"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d"
    }
  ],
  "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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