CVE-2023-53526 (GCVE-0-2023-53526)
Vulnerability from cvelistv5
Published
2025-10-01 11:46
Modified
2025-10-01 11:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: b832174b7f89df3ebab02f5b485d00127a0e1a6e Version: e5c768d809a85e9efd0274b2efe69d4970cc0014 Version: 46f881b5b1758dc4a35fba4a643c10717d0cf427 Version: 46f881b5b1758dc4a35fba4a643c10717d0cf427 Version: 019b59aeb2af6b47d5c8e69c5dc1d731c8df0354 |
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|
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: check \u0027jh-\u003eb_transaction\u0027 before removing it from checkpoint\n\nFollowing process will corrupt ext4 image:\nStep 1:\njbd2_journal_commit_transaction\n __jbd2_journal_insert_checkpoint(jh, commit_transaction)\n // Put jh into trans1-\u003et_checkpoint_list\n journal-\u003ej_checkpoint_transactions = commit_transaction\n // Put trans1 into journal-\u003ej_checkpoint_transactions\n\nStep 2:\ndo_get_write_access\n test_clear_buffer_dirty(bh) // clear buffer dirty\uff0cset jbd dirty\n __jbd2_journal_file_buffer(jh, transaction) // jh belongs to trans2\n\nStep 3:\ndrop_cache\n journal_shrink_one_cp_list\n jbd2_journal_try_remove_checkpoint\n if (!trylock_buffer(bh)) // lock bh, true\n if (buffer_dirty(bh)) // buffer is not dirty\n __jbd2_journal_remove_checkpoint(jh)\n // remove jh from trans1-\u003et_checkpoint_list\n\nStep 4:\njbd2_log_do_checkpoint\n trans1 = journal-\u003ej_checkpoint_transactions\n // jh is not in trans1-\u003et_checkpoint_list\n jbd2_cleanup_journal_tail(journal) // trans1 is done\n\nStep 5: Power cut, trans2 is not committed, jh is lost in next mounting.\n\nFix it by checking \u0027jh-\u003eb_transaction\u0027 before remove it from checkpoint."
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"url": "https://git.kernel.org/stable/c/590a809ff743e7bd890ba5fb36bc38e20a36de53"
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"datePublished": "2025-10-01T11:46:11.862Z",
"dateReserved": "2025-10-01T11:39:39.407Z",
"dateUpdated": "2025-10-01T11:46:11.862Z",
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