{"id":"CVE-2023-53526","title":"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_i…","summary":"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_i…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.15.129, < 5.15.132","linux_kernel >= 6.1.50, < 6.1.54","linux_kernel >= 6.4.13, < 6.5","linux_kernel >= 6.5.1, < 6.5.4","linux_kernel = 6.5"],"patched":["linux_kernel 6.5.4"],"published":"2025-10-01","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:42.257","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53526","references":[{"url":"https://git.kernel.org/stable/c/2298f2589903a8bc03061b54b31fd97985ab6529","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/590a809ff743e7bd890ba5fb36bc38e20a36de53","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dbafe636db415299e54d9dfefc1003bda9e71c9d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ef5fea70e5915afd64182d155e72bfb4f275e1fc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00157,"epssPercentile":0.04831,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:35:25.230111Z"},"ingestedAt":"2026-10-15T22:48:25.407Z","slug":"CVE-2023-53526","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 5.15.129, < 5.15.132`\n- `linux_kernel >= 6.1.50, < 6.1.54`\n- `linux_kernel >= 6.4.13, < 6.5`\n- `linux_kernel >= 6.5.1, < 6.5.4`\n- `linux_kernel = 6.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.4`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}