Skip to main content

Boteraser | Website and Server Security Solutions

🛡️ CVE-2023-53210 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

md/raid5-cache: fix null-ptr-deref for r5l_flush_stripe_to_raid()

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

md/raid5-cache: fix null-ptr-deref for r5l_flush_stripe_to_raid()

r5l_flush_stripe_to_raid() will check if the list 'flushing_ios' is

empty, and then submit 'flush_bio', however, r5l_log_flush_endio()

is clearing the list first and then clear the bio, which will cause

null-ptr-deref:

T1: submit flush io

raid5d

handle_active_stripes

r5l_flush_stripe_to_raid

// list is empty

// add 'io_end_ios' to the list

bio_init

submit_bio

// io1

T2: io1 is done

r5l_log_flush_endio

list_splice_tail_init

// clear the list

T3: submit new flush io

...

r5l_flush_stripe_to_raid

// list is empty

// add 'io_end_ios' to the list

bio_init

bio_uninit

// clear bio->bi_blkg

submit_bio

// null-ptr-deref

Fix this problem by clearing bio before clearing the list in

r5l_log_flush_endio().

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 none, integrity none, 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:N/I:N/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: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-53210 is recorded against 2 packages.

  • kernel (from 6.5.0 up to 6.5.3)
  • linux-kernel (from 6.5 up to 6.5.3)

Timeline and source

Published on 15 September 2025 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)
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-2023-53210 on other distributions

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

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-15
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.5.0 6.5.3
linux-kernel 6.5 6.5.3

Similar Threats

Vulnerability Monitoring

Track new vulnerabilities in kernel

CVE-2023-53210 is rated CVSS 5.5 Medium. BotEraser monitors your WordPress installation and notifies you when software you use appears in our vulnerability database.

Set Up Free Alerts →

No credit card required  ·  Results in minutes

ⓘ 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.

Browse related advisories

All advisoriesCVECVE 2023
✓