fkie_cve-2023-53260
Vulnerability from fkie_nvd
Published
2025-09-15 15:15
Modified
2025-09-15 15:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ovl: fix null pointer dereference in ovl_permission()
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/0xb0
Fetch a reproducer in [Link].
Use the helper ovl_i_path_realinode() to get realinode and then do
non-nullptr checking.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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, \u0026realpath)\n path-\u003edentry = 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-\u003e__upperdentry)\n\t\t dentry_kill(upperdentry)\n\t\t dentry_unlink_inode\n\t\t\t\t upperdentry-\u003ed_inode = NULL\n realinode = d_inode(realpath.dentry) // return NULL\n inode_permission(realinode)\n inode-\u003ei_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] \u003cTASK\u003e\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."
}
],
"id": "CVE-2023-53260",
"lastModified": "2025-09-15T15:22:27.090",
"metrics": {},
"published": "2025-09-15T15:15:53.430",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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