LiveActive security incident?Get immediate response
CVE Record

CVE-2023-53526: jbd2: check 'jh->b_transaction' before removing it from checkpoint

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.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel bug can corrupt ext4 file systems under a specific journaling race and power-loss sequence. The source describes data integrity risk, not remote code execution. Business urgency depends on how many Linux systems use ext4 for important workloads and whether they run an affected kernel build.

Executive priority

Treat this as a data integrity issue requiring normal-to-elevated patch priority for critical Linux storage workloads. It is not sourced as internet-exploited or remote code execution, but corruption risk can still affect availability and recovery costs.

Technical view

The flaw is in jbd2 checkpoint handling. A journal head can be removed from a checkpoint list without first checking jh->b_transaction, allowing a later checkpoint cleanup to treat a transaction as complete while data tied to another transaction is lost after power interruption.

Likely exposure

Exposure is likely limited to Linux systems using ext4/jbd2 on affected kernel versions or downstream builds. The bundle lists several Linux stable commits and versions, but distro backport status is not provided, so package-level exposure requires vendor mapping.

Exploitation context

No CISA KEV listing or cited source reports active exploitation. The public description shows a corruption sequence involving journal operations, cache dropping, checkpoint cleanup, and power loss. Evidence does not establish a practical attacker-controlled exploit path.

Researcher notes

The key fix is checking jh->b_transaction before checkpoint removal. The available source is kernel-resolution text plus stable commit references; it lacks CVSS, CWE, exploitability analysis, and downstream distribution status.

Mitigation direction

  • Identify Linux hosts using ext4 for critical data.
  • Map running kernels to vendor advisories for CVE-2023-53526.
  • Apply vendor kernel updates containing the referenced jbd2 fix.
  • Prioritize storage, database, and appliance workloads using ext4.
  • Maintain tested backups for systems pending kernel updates.

Validation and detection

  • Inventory kernel versions across Linux fleets.
  • Confirm ext4 usage with existing configuration management data.
  • Check vendor kernel changelogs for the referenced stable commits.
  • After updates, verify hosts boot the patched kernel.
  • Review storage incident logs for unexplained ext4 corruption.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2023-53526 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb832174b7f89df3ebab02f5b485d00127a0e1a6e, e5c768d809a85e9efd0274b2efe69d4970cc0014, 46f881b5b1758dc4a35fba4a643c10717d0cf427, 46f881b5b1758dc4a35fba4a643c10717d0cf427, 019b59aeb2af6b47d5c8e69c5dc1d731c8df0354, 5.15.129, 6.1.50, 6.4.13unaffected
LinuxLinux6.5, 0, 5.15.132, 6.1.54, 6.5.4, 6.6affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.