ghsa-rhfj-r57g-8474
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2023-53526"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T12:15:57Z",
"severity": null
},
"details": "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.",
"id": "GHSA-rhfj-r57g-8474",
"modified": "2025-10-01T12:30:31Z",
"published": "2025-10-01T12:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53526"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2298f2589903a8bc03061b54b31fd97985ab6529"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/590a809ff743e7bd890ba5fb36bc38e20a36de53"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dbafe636db415299e54d9dfefc1003bda9e71c9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ef5fea70e5915afd64182d155e72bfb4f275e1fc"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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