fkie_cve-2022-49345
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-09-22 20:27
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: net: xfrm: unexport __init-annotated xfrm4_protocol_init() 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, net/ipv4/xfrm4_policy.c is never compiled as modular. (CONFIG_XFRM is boolean)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b253fbc9f7b5db18d716436bdcf8ecef09fd63dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/31f3c6a4dcd3260a386e62cef2d5b36e902600a1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a388f08d8784af48f352193d2b72aaf167a57a1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85a055c03691e51499123194a14a0c249cf33227Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be3884d5cd04ccd58294b83a02d70b7c5fca19d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c58d82a1264813e69119c13e9804e2e60b664ad5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e04d59cfe0c0129df7aba7ef7bb17b96be2a64f2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e53cd3814504b2cadaba4d5a8a07eeea9ddacd03Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef6d2354de238b065d8799c80da4be9a6af18e39Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.19


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xfrm: unexport __init-annotated xfrm4_protocol_init()\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,\nnet/ipv4/xfrm4_policy.c is never compiled as modular.\n(CONFIG_XFRM is boolean)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: xfrm: unexport __init-annotated xfrm4_protocol_init() 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, net/ipv4/xfrm4_policy.c nunca se compila como modular. (CONFIG_XFRM es booleano)"
    }
  ],
  "id": "CVE-2022-49345",
  "lastModified": "2025-09-22T20:27:33.800",
  "metrics": {
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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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2025-02-26T07:01:11.237",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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