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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00025.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
332f606b32b6291a944c8cf23b91f53a6e676525 affected < d97481c7b2739a704848bb3c01f224dc71bdf78e
332f606b32b6291a944c8cf23b91f53a6e676525 affected < c4a5fb1ae5d3f02d3227afde2b9339994389463d
332f606b32b6291a944c8cf23b91f53a6e676525 affected < d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4
332f606b32b6291a944c8cf23b91f53a6e676525 affected < f4e19e595cc2e76a8a58413eb19d3d9c51328b53
Linux Linux affected
Version Status Constraints
5.15 affected —
0 unaffected < 5.15
5.15.121 unaffected ≤ 5.15.*
6.1.40 unaffected ≤ 6.1.*
6.4.4 unaffected ≤ 6.4.*
6.5 unaffected ≤ *

No data.

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Fixes

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No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/c4a5fb1ae5d3f02d3227afde2b9339994389463d cve-icon cve-icon
https://git.kernel.org/stable/c/d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4 cve-icon cve-icon
https://git.kernel.org/stable/c/d97481c7b2739a704848bb3c01f224dc71bdf78e cve-icon cve-icon
https://git.kernel.org/stable/c/f4e19e595cc2e76a8a58413eb19d3d9c51328b53 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025123036-CVE-2023-54313-f889@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-54313 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-54313 cve-icon
History

Wed, 31 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 30 Dec 2025 12:45:00 +0000

Type Values Removed Values Added
Description 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.
Title ovl: fix null pointer dereference in ovl_get_acl_rcu()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-30T12:23:44.484Z

Reserved: 2025-12-30T12:06:44.531Z

Link: CVE-2023-54313

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-30T13:16:20.540

Modified: 2025-12-31T20:42:43.210

Link: CVE-2023-54313

cve-icon Redhat

Severity : Low

Publid Date: 2025-12-30T00:00:00Z

Links: CVE-2023-54313 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.