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CVE-2026-72225

HIGHCVSS 7.8/10EPSS 0.22%

Last modified

CVE-2026-72225 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

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
7.8/10

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

EPSS Probability
0.22%

12.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

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

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72225?
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.
How severe is CVE-2026-72225?
CVE-2026-72225 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72225?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST