nvd-json-data-feeds/CVE-2024/CVE-2024-502xx/CVE-2024-50265.json

{
  "id": "CVE-2024-50265",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-11-19T02:16:28.310",
  "lastModified": "2024-11-21T19:28:00.687",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()\n\nSyzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():\n\n[   57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12\n[   57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper.  Leaking 1 clusters and removing the entry\n[   57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004\n[...]\n[   57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[...]\n[   57.331328] Call Trace:\n[   57.331477]  <TASK>\n[...]\n[   57.333511]  ? do_user_addr_fault+0x3e5/0x740\n[   57.333778]  ? exc_page_fault+0x70/0x170\n[   57.334016]  ? asm_exc_page_fault+0x2b/0x30\n[   57.334263]  ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10\n[   57.334596]  ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[   57.334913]  ocfs2_xa_remove_entry+0x23/0xc0\n[   57.335164]  ocfs2_xa_set+0x704/0xcf0\n[   57.335381]  ? _raw_spin_unlock+0x1a/0x40\n[   57.335620]  ? ocfs2_inode_cache_unlock+0x16/0x20\n[   57.335915]  ? trace_preempt_on+0x1e/0x70\n[   57.336153]  ? start_this_handle+0x16c/0x500\n[   57.336410]  ? preempt_count_sub+0x50/0x80\n[   57.336656]  ? _raw_read_unlock+0x20/0x40\n[   57.336906]  ? start_this_handle+0x16c/0x500\n[   57.337162]  ocfs2_xattr_block_set+0xa6/0x1e0\n[   57.337424]  __ocfs2_xattr_set_handle+0x1fd/0x5d0\n[   57.337706]  ? ocfs2_start_trans+0x13d/0x290\n[   57.337971]  ocfs2_xattr_set+0xb13/0xfb0\n[   57.338207]  ? dput+0x46/0x1c0\n[   57.338393]  ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338665]  ? ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338948]  __vfs_removexattr+0x92/0xc0\n[   57.339182]  __vfs_removexattr_locked+0xd5/0x190\n[   57.339456]  ? preempt_count_sub+0x50/0x80\n[   57.339705]  vfs_removexattr+0x5f/0x100\n[...]\n\nReproducer uses faultinject facility to fail ocfs2_xa_remove() ->\nocfs2_xa_value_truncate() with -ENOMEM.\n\nIn this case the comment mentions that we can return 0 if\nocfs2_xa_cleanup_value_truncate() is going to wipe the entry\nanyway. But the following 'rc' check is wrong and execution flow do\n'ocfs2_xa_remove_entry(loc);' twice:\n* 1st: in ocfs2_xa_cleanup_value_truncate();\n* 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'.\n\nFix this by skipping the 2nd removal of the same entry and making\nsyzkaller repro happy."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: eliminar la entrada una vez en lugar de la desreferencia ptr nula en ocfs2_xa_remove() Syzkaller puede provocar la desreferencia ptr nula en ocfs2_xa_remove(): [ 57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12 [ 57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Truncamiento parcial al eliminar xattr overlay.upper. Fuga de 1 cl\u00faster y eliminaci\u00f3n de la entrada [ 57.321727] ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000004 [...] [ 57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [...] [ 57.331328] Seguimiento de llamadas: [ 57.331477]  [...] [ 57.333511] ? do_user_addr_fault+0x3e5/0x740 [ 57.333778] ? exc_page_fault+0x70/0x170 [ 57.334016] ? asm_exc_page_fault+0x2b/0x30 [ 57.334263] ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10 [ 57.334596] ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [ 57.334913] ocfs2_xa_remove_entry+0x23/0xc0 [ 57.335164] ocfs2_xa_set+0x704/0xcf0 [ 57.335381] ? _raw_spin_unlock+0x1a/0x40 [ 57.335620] ? ocfs2_inode_cache_unlock+0x16/0x20 [ 57.335915] ? trace_preempt_on+0x1e/0x70 [ 57.336153] ? start_this_handle+0x16c/0x500 [ 57.336410] ? preempt_count_sub+0x50/0x80 [ 57.336656] ? _raw_read_unlock+0x20/0x40 [ 57.336906] ? ocfs2_xattr_set_handle+0x1fd/0x5d0 [ 57.337706] ? ocfs2_start_trans+0x13d/0x290 [ 57.337971] ocfs2_xattr_set+0xb13/0xfb0 [ 57.338207] ? dput+0x46/0x1c0 [ 57.338393] ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338665] ? ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338948] __vfs_removexattr+0x92/0xc0 [ 57.339182] __vfs_removexattr_locked+0xd5/0x190 [ 57.339456] ? preempt_count_sub+0x50/0x80 [ 57.339705] vfs_removexattr+0x5f/0x100 [...] El reproductor utiliza la funci\u00f3n faultinject para hacer que ocfs2_xa_remove() -&gt; ocfs2_xa_value_truncate() falle con -ENOMEM. En este caso, el comentario menciona que podemos devolver 0 si ocfs2_xa_cleanup_value_truncate() va a borrar la entrada de todos modos. Pero la siguiente comprobaci\u00f3n de 'rc' es incorrecta y el flujo de ejecuci\u00f3n ejecuta 'ocfs2_xa_remove_entry(loc);' dos veces: * 1.\u00aa: en ocfs2_xa_cleanup_value_truncate(); * 2.\u00aa: regresa a ocfs2_xa_remove() en lugar de ir a 'out'. Solucione esto omitiendo la segunda eliminaci\u00f3n de la misma entrada y haciendo que syzkaller repro funcione correctamente."
    }
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        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
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  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
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