CVE-2023-53260

MEDIUM EPSS 3.2%
Published Sep 15, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 15, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel*≥5.19  –  <6.1.43
linuxlinux_kernel*≥6.2  –  <6.4.4

References 3

  • git.kernel.org https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4
    Patch