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🛡️ CVE-2023-52468 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

class: fix use-after-free in class_register()

In the Linux kernel, the following vulnerability has been resolved:

class: fix use-after-free in class_register()

The lock_class_key is still registered and can be found in

lock_keys_hash hlist after subsys_private is freed in error

handler path.A task who iterate over the lock_keys_hash

later may cause use-after-free.So fix that up and unregister

the lock_class_key before kfree(cp).

On our platform, a driver fails to kset_register because of

creating duplicate filename '/class/xxx'.With Kasan enabled,

it prints a invalid-access bug report.

KASAN bug report:

BUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc

Write of size 8 at addr 15ffff808b8c0368 by task modprobe/252

Pointer tag: [15], memory tag: [fe]

CPU: 7 PID: 252 Comm: modprobe Tainted: G W

6.6.0-mainline-maybe-dirty #1

Call trace:

dump_backtrace+0x1b0/0x1e4

show_stack+0x2c/0x40

dump_stack_lvl+0xac/0xe0

print_report+0x18c/0x4d8

kasan_report+0xe8/0x148

__hwasan_store8_noabort+0x88/0x98

lockdep_register_key+0x19c/0x1bc

class_register+0x94/0x1ec

init_module+0xbc/0xf48 [rfkill]

do_one_initcall+0x17c/0x72c

do_init_module+0x19c/0x3f8

...

Memory state around the buggy address:

ffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a

ffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe

>ffffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe

^

ffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03

As CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access

not use-after-free here.In this case, modprobe is manipulating

the corrupted lock_keys_hash hlish where lock_class_key is already

freed before.

It's worth noting that this only can happen if lockdep is enabled,

which is not true for normal system.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-52468 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.7.2)
  • linux-kernel (from 6.7.0 up to 6.7.2)

Timeline and source

Published on 25 February 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

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-2023-52468 on other distributions

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

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-02-25
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.7.2
linux-kernel 6.7.0 6.7.2

Similar Threats

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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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