CVE-2026-72225jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 6866d7b3f2bb4f011041ba54c98b1584497fe2fd before aa90f00932bf572d6ef284c977c2a60b39c13bd6; from 6866d7b3f2bb4f011041ba54c98b1584497fe2fd before e144ad0250f77e23e28949587b8b57e40dc3b512; 6866d7b3f2bb4f011041ba54c98b1584497fe2fd builds before 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6; from 6866d7b3f2bb4f011041ba54c98b1584497fe2fd before fb9b49618ed7296ebfad62a3835da8945f727001; 6866d7b3f2bb4f011041ba54c98b1584497fe2fd builds before 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9; from 6866d7b3f2bb4f011041ba54c98b1584497fe2fd before 78955fdce8ff654e6d33a2fa90882a1e7eb26330; from 6866d7b3f2bb4f011041ba54c98b1584497fe2fd before a58fc10adf503969fec2007b5afe8987258046c4; 6866d7b3f2bb4f011041ba54c98b1584497fe2fd builds before 289a2ca0c9b7eae74f93fc213b0b971669b8683d | CNA record |
References
- https://git.kernel.org/stable/c/aa90f00932bf572d6ef284c977c2a60b39c13bd6
- https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512
- https://git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6
- https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001
- https://git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9
- https://git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330
- https://git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4
- https://git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.