---
cve: "CVE-2023-53526"
severity: "HIGH"
cvss: 7.8
epss: "14%"
vendor: "Linux"
kev: false
exploited: false
published: "2025-10-01 12:15:57"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T22:06:08+02:00"
---

# CVE-2023-53526

> 7.8 HIGH

## Beschreibung

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

jbd2: check 'jh->b_transaction' before removing it from checkpoint

Following process will corrupt ext4 image:
Step 1:
jbd2_journal_commit_transaction
 __jbd2_journal_insert_checkpoint(jh, commit_transaction)
 // Put jh into trans1->t_checkpoint_list
 journal->j_checkpoint_transactions = commit_transaction
 // Put trans1 into journal->j_checkpoint_transactions

Step 2:
do_get_write_access
 test_clear_buffer_dirty(bh) // clear buffer dirty，set jbd dirty
 __jbd2_journal_file_buffer(jh, transaction) // jh belongs to trans2

Step 3:
drop_cache
 journal_shrink_one_cp_list
  jbd2_journal_try_remove_checkpoint
   if (!trylock_buffer(bh))  // lock bh, true
   if (buffer_dirty(bh))     // buffer is not dirty
   __jbd2_journal_remove_checkpoint(jh)
   // remove jh from trans1->t_checkpoint_list

Step 4:
jbd2_log_do_checkpoint
 trans1 = journal->j_checkpoint_transactions
 // jh is not in trans1->t_checkpoint_list
 jbd2_cleanup_journal_tail(journal)  // trans1 is done

Step 5: Power cut, trans2 is not committed, jh is lost in next mounting.

Fix it by checking 'jh->b_transaction' before remove it from checkpoint.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.15.132
- Kernel ≥ 6.1.54
- Kernel ≥ 6.5.4

## Referenzen

- <https://git.kernel.org/stable/c/ef5fea70e5915afd64182d155e72bfb4f275e1fc>
- <https://git.kernel.org/stable/c/dbafe636db415299e54d9dfefc1003bda9e71c9d>
- <https://git.kernel.org/stable/c/2298f2589903a8bc03061b54b31fd97985ab6529>
- <https://git.kernel.org/stable/c/590a809ff743e7bd890ba5fb36bc38e20a36de53>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-53526) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_