cbcvebase.
CVE-2023-53260
published 2025-09-15

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…

PriorityP418medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.13%
3.3th percentile
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

10 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.52-1 (bookworm)linux 6.1.52-1 (bookworm)
linuxlinux——
linuxlinux>= 4b7791b2e95805eaa9568761741d33cf929c930c < 53dd2ca2c02fdcfe3aad2345091d371063f97d1753dd2ca2c02fdcfe3aad2345091d371063f97d17
linuxlinux>= 4b7791b2e95805eaa9568761741d33cf929c930c < 69f9ae7edf9ec0ff500429101923347fcba5c8c469f9ae7edf9ec0ff500429101923347fcba5c8c4
linuxlinux>= 4b7791b2e95805eaa9568761741d33cf929c930c < 1a73f5b8f079fd42a544c1600beface50c63af7c1a73f5b8f079fd42a544c1600beface50c63af7c
linuxlinux_kernel>= 0 < 6.1.52-16.1.52-1
linuxlinux_kernel>= 0 < 6.4.4-16.4.4-1
linuxlinux_kernel>= 0 < 6.4.4-16.4.4-1
linuxlinux_kernel>= 5.19 < 6.1.436.1.43
linuxlinux_kernel>= 6.2 < 6.4.46.4.4

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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