CVE-2026-72225
jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new unknown vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Linux / Linux
6866d7b3f2bb4f011041ba54c98b1584497fe2fd < e144ad0250f77e23e28949587b8b57e40dc3b512 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < fb9b49618ed7296ebfad62a3835da8945f727001 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < 78955fdce8ff654e6d33a2fa90882a1e7eb26330 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < a58fc10adf503969fec2007b5afe8987258046c4 6866d7b3f2bb4f011041ba54c98b1584497fe2fd < 289a2ca0c9b7eae74f93fc213b0b971669b8683d
Linux / Linux
5.10
References
git.kernel.org: https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512 git.kernel.org: https://git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 git.kernel.org: https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001 git.kernel.org: https://git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 git.kernel.org: https://git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330 git.kernel.org: https://git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4 git.kernel.org: https://git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d