CVE-2026-72225 (GCVE-0-2026-72225)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-10-16 18:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
Version: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd
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