FKIE_CVE-2024-40951

Vulnerability from fkie_nvd - Published: 2024-07-12 13:15 - Updated: 2025-04-16 19:15
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: ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger() bdev->bd_super has been removed and commit 8887b94d9322 change the usage from bdev->bd_super to b_assoc_map->host->i_sb. Since ocfs2 hasn't set bh->b_assoc_map, it will trigger NULL pointer dereference when calling into ocfs2_abort_trigger(). Actually this was pointed out in history, see commit 74e364ad1b13. But I've made a mistake when reviewing commit 8887b94d9322 and then re-introduce this regression. Since we cannot revive bdev in buffer head, so fix this issue by initializing all types of ocfs2 triggers when fill super, and then get the specific ocfs2 trigger from ocfs2_caching_info when access journal. [joseph.qi@linux.alibaba.com: v2]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734cePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.10
linux linux_kernel 6.10
linux linux_kernel 6.10
linux linux_kernel 6.10
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()\n\nbdev-\u003ebd_super has been removed and commit 8887b94d9322 change the usage\nfrom bdev-\u003ebd_super to b_assoc_map-\u003ehost-\u003ei_sb.  Since ocfs2 hasn\u0027t set\nbh-\u003eb_assoc_map, it will trigger NULL pointer dereference when calling\ninto ocfs2_abort_trigger().\n\nActually this was pointed out in history, see commit 74e364ad1b13.  But\nI\u0027ve made a mistake when reviewing commit 8887b94d9322 and then\nre-introduce this regression.\n\nSince we cannot revive bdev in buffer head, so fix this issue by\ninitializing all types of ocfs2 triggers when fill super, and then get the\nspecific ocfs2 trigger from ocfs2_caching_info when access journal.\n\n[joseph.qi@linux.alibaba.com: v2]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: corrige la desreferencia del puntero NULL en ocfs2_abort_trigger() bdev-\u0026gt;bd_super se ha eliminado y el commit 8887b94d9322 cambia el uso de bdev-\u0026gt;bd_super a b_assoc_map-\u0026gt;host-\u0026gt;i_sb. Dado que ocfs2 no ha configurado bh-\u0026gt;b_assoc_map, activar\u00e1 la desreferencia del puntero NULL al llamar a ocfs2_abort_trigger(). En realidad, esto se se\u00f1al\u00f3 en la historia, consulte el commit 74e364ad1b13. Pero comet\u00ed un error al revisar el commit 8887b94d9322 y luego reintroducir esta regresi\u00f3n. Dado que no podemos reactivar bdev en el encabezado del b\u00fafer, solucione este problema inicializando todos los tipos de activadores de ocfs2 cuando complete el super, y luego obtenga el activador de ocfs2 espec\u00edfico de ocfs2_caching_info cuando acceda al diario. [joseph.qi@linux.alibaba.com:v2] Enlace: https://lkml.kernel.org/r/20240602112045.1112708-1-joseph.qi@linux.alibaba.com"
    }
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  "id": "CVE-2024-40951",
  "lastModified": "2025-04-16T19:15:51.443",
  "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"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-07-12T13:15:17.420",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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}


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