ghsa-mvvw-5ww4-3hgm
Vulnerability from github
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] [ 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.
{
"affected": [],
"aliases": [
"CVE-2023-53260"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-15T15:15:53Z",
"severity": null
},
"details": "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": "GHSA-mvvw-5ww4-3hgm",
"modified": "2025-09-15T15:31:30Z",
"published": "2025-09-15T15:31:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53260"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4"
}
],
"schema_version": "1.4.0",
"severity": []
}
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.