fkie_cve-2023-54313
Vulnerability from fkie_nvd
Published
2025-12-30 13:16
Modified
2025-12-30 13:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ovl: fix null pointer dereference in ovl_get_acl_rcu() Following process: P1 P2 path_openat link_path_walk may_lookup inode_permission(rcu) ovl_permission acl_permission_check check_acl get_cached_acl_rcu ovl_get_inode_acl realinode = ovl_inode_real(ovl_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 ovl_inode_upper upperdentry = ovl_i_dentry_upper(ovl_inode) d_inode(upperdentry) // returns NULL IS_POSIXACL(realinode) // NULL pointer dereference , will trigger an null pointer dereference at realinode: [ 205.472797] BUG: kernel NULL pointer dereference, address: 0000000000000028 [ 205.476701] CPU: 2 PID: 2713 Comm: ls Not tainted 6.3.0-12064-g2edfa098e750-dirty #1216 [ 205.478754] RIP: 0010:do_ovl_get_acl+0x5d/0x300 [ 205.489584] Call Trace: [ 205.489812] <TASK> [ 205.490014] ovl_get_inode_acl+0x26/0x30 [ 205.490466] get_cached_acl_rcu+0x61/0xa0 [ 205.490908] generic_permission+0x1bf/0x4e0 [ 205.491447] ovl_permission+0x79/0x1b0 [ 205.491917] inode_permission+0x15e/0x2c0 [ 205.492425] link_path_walk+0x115/0x550 [ 205.493311] path_lookupat.isra.0+0xb2/0x200 [ 205.493803] filename_lookup+0xda/0x240 [ 205.495747] 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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4a5fb1ae5d3f02d3227afde2b9339994389463d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d97481c7b2739a704848bb3c01f224dc71bdf78e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4e19e595cc2e76a8a58413eb19d3d9c51328b53
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix null pointer dereference in ovl_get_acl_rcu()\n\nFollowing process:\n         P1                     P2\n path_openat\n  link_path_walk\n   may_lookup\n    inode_permission(rcu)\n     ovl_permission\n      acl_permission_check\n       check_acl\n        get_cached_acl_rcu\n\t ovl_get_inode_acl\n\t  realinode = ovl_inode_real(ovl_inode)\n\t                      drop_cache\n\t\t               __dentry_kill(ovl_dentry)\n\t\t\t\tiput(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\t    ovl_inode_upper\n\t     upperdentry = ovl_i_dentry_upper(ovl_inode)\n\t     d_inode(upperdentry) // returns NULL\n\t  IS_POSIXACL(realinode) // NULL pointer dereference\n, will trigger an null pointer dereference at realinode:\n  [  205.472797] BUG: kernel NULL pointer dereference, address:\n                 0000000000000028\n  [  205.476701] CPU: 2 PID: 2713 Comm: ls Not tainted\n                 6.3.0-12064-g2edfa098e750-dirty #1216\n  [  205.478754] RIP: 0010:do_ovl_get_acl+0x5d/0x300\n  [  205.489584] Call Trace:\n  [  205.489812]  \u003cTASK\u003e\n  [  205.490014]  ovl_get_inode_acl+0x26/0x30\n  [  205.490466]  get_cached_acl_rcu+0x61/0xa0\n  [  205.490908]  generic_permission+0x1bf/0x4e0\n  [  205.491447]  ovl_permission+0x79/0x1b0\n  [  205.491917]  inode_permission+0x15e/0x2c0\n  [  205.492425]  link_path_walk+0x115/0x550\n  [  205.493311]  path_lookupat.isra.0+0xb2/0x200\n  [  205.493803]  filename_lookup+0xda/0x240\n  [  205.495747]  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-2023-54313",
  "lastModified": "2025-12-30T13:16:20.540",
  "metrics": {},
  "published": "2025-12-30T13:16:20.540",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c4a5fb1ae5d3f02d3227afde2b9339994389463d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d97481c7b2739a704848bb3c01f224dc71bdf78e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f4e19e595cc2e76a8a58413eb19d3d9c51328b53"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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