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🛡️ CVE-2023-54313 — kernel

⚪ Unknown ✅ No Known Exploit NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ovl: fix null pointer dereference in ovl_get_acl_rcu()

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.

Affected software

CVE-2023-54313 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.4.4)
  • unknown

Timeline and source

Published on 30 December 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-54313 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-30
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.4.4
unknown — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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