CVE-2023-53260

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2023-53260
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c Patch
https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17 Patch
https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

02 Dec 2025, 20:45

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-476
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c - () https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c - Patch
References () https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17 - () https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17 - Patch
References () https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4 - () https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4 - Patch
Information

Published : 2025-09-15 15:15

Updated : 2025-12-02 20:45

NVD link : CVE-2023-53260

Mitre link : CVE-2023-53260

CVE.ORG link : CVE-2023-53260

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference