FKIE_CVE-2022-49726

Vulnerability from fkie_nvd - Published: 2025-02-26 07:01 - Updated: 2025-10-24 18:52
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036dPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.19
linux linux_kernel 5.19
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  "descriptions": [
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      "lang": "en",
      "value": "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)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() EXPORT_SYMBOL y __init es una mala combinaci\u00f3n porque la secci\u00f3n .init.text se libera despu\u00e9s de la inicializaci\u00f3n. Por lo tanto, los m\u00f3dulos no pueden usar s\u00edmbolos anotados __init. El acceso a un s\u00edmbolo liberado puede terminar con un p\u00e1nico del kernel. modpost sol\u00eda detectarlo, pero ha estado roto durante una d\u00e9cada. Recientemente, arregl\u00e9 modpost para que comenzara a advertirlo nuevamente, luego apareci\u00f3 en las compilaciones de linux-next. Hay dos formas de solucionarlo: - Eliminar __init - Eliminar EXPORT_SYMBOL Eleg\u00ed la \u00faltima para este caso porque el \u00fanico sitio de llamada en el \u00e1rbol, arch/x86/kernel/cpu/mshyperv.c nunca se compila como modular. (CONFIG_HYPERVISOR_GUEST es booleano)"
    }
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  "id": "CVE-2022-49726",
  "lastModified": "2025-10-24T18:52:35.017",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-02-26T07:01:48.257",
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  "vulnStatus": "Analyzed",
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      "source": "nvd@nist.gov",
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}


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