{"cve":"CVE-2023-53526","nvd":{"published":"2025-10-01T12:15:57.177","modified":"2026-10-15T22:17:42.257","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: check 'jh->b_transaction' 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->t_checkpoint_list\n journal->j_checkpoint_transactions = commit_transaction\n // Put trans1 into journal->j_checkpoint_transactions\n\nStep 2:\ndo_get_write_access\n test_clear_buffer_dirty(bh) // clear buffer dirty，set 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->t_checkpoint_list\n\nStep 4:\njbd2_log_do_checkpoint\n trans1 = journal->j_checkpoint_transactions\n // jh is not in trans1->t_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 'jh->b_transaction' before remove it from checkpoint.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/2298f2589903a8bc03061b54b31fd97985ab6529","https://git.kernel.org/stable/c/590a809ff743e7bd890ba5fb36bc38e20a36de53","https://git.kernel.org/stable/c/dbafe636db415299e54d9dfefc1003bda9e71c9d","https://git.kernel.org/stable/c/ef5fea70e5915afd64182d155e72bfb4f275e1fc"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2023-53526","score":0.00157,"percentile":0.04835,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}