CVE-2026-72225

HighCVSS 7.8/10Last modified Oct 16, 2026

Description

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < aa90f00932bf572d6ef284c977c2a60b39c13bd6; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < e144ad0250f77e23e28949587b8b57e40dc3b512; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < fb9b49618ed7296ebfad62a3835da8945f727001; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < 78955fdce8ff654e6d33a2fa90882a1e7eb26330; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < a58fc10adf503969fec2007b5afe8987258046c4; >= 6866d7b3f2bb4f011041ba54c98b1584497fe2fd, < 289a2ca0c9b7eae74f93fc213b0b971669b8683d
LinuxLinux5.10

References

Timeline

Published
Aug 15, 2026
Last modified
Oct 16, 2026
NVD status
Received

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CVE-2026-72225: High severity, CVSS 7.8 | Vulnix