CVE-2023-53260
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ovl: fix null pointer dereference in ovl_permission()
Fetch a reproducer in [Link].
Use the helper ovl_i_path_realinode() to get realinode and then do non-nullptr checking.
Detalles técnicos trazas, registros y código del informe original
Following process:
P1 P2
path_lookupat
link_path_walk
inode_permission
ovl_permission
ovl_i_path_real(inode, &realpath)
path->dentry = ovl_i_dentry_upper(inode)
drop_cache
__dentry_kill(ovl_dentry)
iput(ovl_inode)
ovl_destroy_inode(ovl_inode)
dput(oi->__upperdentry)
dentry_kill(upperdentry)
dentry_unlink_inode
upperdentry->d_inode = NULL
realinode = d_inode(realpath.dentry) // return NULL
inode_permission(realinode)
inode->i_sb // NULL pointer dereference
, will trigger an null pointer dereference at realinode:
[ 335.664979] BUG: kernel NULL pointer dereference,
address: 0000000000000002
[ 335.668032] CPU: 0 PID: 2592 Comm: ls Not tainted 6.3.0
[ 335.669956] RIP: 0010:inode_permission+0x33/0x2c0
[ 335.678939] Call Trace:
[ 335.679165] <TASK>
[ 335.679371] ovl_permission+0xde/0x320
[ 335.679723] inode_permission+0x15e/0x2c0
[ 335.680090] link_path_walk+0x115/0x550
[ 335.680771] path_lookupat.isra.0+0xb2/0x200
[ 335.681170] filename_lookup+0xda/0x240
[ 335.681922] vfs_statx+0xa6/0x1f0
[ 335.682233] vfs_fstatat+0x7b/0xb0CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.15%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
- CWE-476
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix null pointer dereference in ovl_permission()\n\nFollowing process:\n P1 P2\n path_lookupat\n link_path_walk\n inode_permission\n ovl_permission\n ovl_i_path_real(inode, &realpath)\n path->dentry = ovl_i_dentry_upper(inode)\n drop_cache\n\t\t\t __dentry_kill(ovl_dentry)\n\t\t iput(ovl_inode)\n\t\t ovl_destroy_inode(ovl_inode)\n\t\t dput(oi->__upperdentry)\n\t\t dentry_kill(upperdentry)\n\t\t dentry_unlink_inode\n\t\t\t\t upperdentry->d_inode = NULL\n realinode = d_inode(realpath.dentry) // return NULL\n inode_permission(realinode)\n inode->i_sb // NULL pointer dereference\n, will trigger an null pointer dereference at realinode:\n [ 335.664979] BUG: kernel NULL pointer dereference,\n address: 0000000000000002\n [ 335.668032] CPU: 0 PID: 2592 Comm: ls Not tainted 6.3.0\n [ 335.669956] RIP: 0010:inode_permission+0x33/0x2c0\n [ 335.678939] Call Trace:\n [ 335.679165] <TASK>\n [ 335.679371] ovl_permission+0xde/0x320\n [ 335.679723] inode_permission+0x15e/0x2c0\n [ 335.680090] link_path_walk+0x115/0x550\n [ 335.680771] path_lookupat.isra.0+0xb2/0x200\n [ 335.681170] filename_lookup+0xda/0x240\n [ 335.681922] vfs_statx+0xa6/0x1f0\n [ 335.682233] vfs_fstatat+0x7b/0xb0\n\nFetch a reproducer in [Link].\n\nUse the helper ovl_i_path_realinode() to get realinode and then do\nnon-nullptr checking."
}
],
"lastModified": "2026-06-17T06:44:39.787",
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