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nvd-json-data-feeds/CVE-2024/CVE-2024-502xx/CVE-2024-50265.json
cad-safe-bot e6cbafdc40 Auto-Update: 2024-12-08T03:00:18.988682+00:00
2024-12-08 03:06:42 +00:00

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{
"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."
}
],
"metrics": {
"cvssMetricV31": [
{
"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
}
]
},
"weaknesses": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
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