7.8
HIGH
CVSS 3.1
CVE-2026-72225
jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Overview
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.
Details
INFO
Published Date :
Aug. 15, 2026, 6:21 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Fix an integer underflow in jbd2_journal_initialize_fast_commit to prevent journal corruption.
- Validate num_fc_blks against j_last before subtraction.
- Apply the provided patch to the Linux kernel.
- Update the Linux kernel to a secure version.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72225.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72225 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72225
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72225 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72225 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'e144ad0250f77e23e28949587b8b57e40dc3b512', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'fb9b49618ed7296ebfad62a3835da8945f727001', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '78955fdce8ff654e6d33a2fa90882a1e7eb26330', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'a58fc10adf503969fec2007b5afe8987258046c4', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '289a2ca0c9b7eae74f93fc213b0b971669b8683d', 'versionType': 'git'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'e144ad0250f77e23e28949587b8b57e40dc3b512', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'fb9b49618ed7296ebfad62a3835da8945f727001', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '78955fdce8ff654e6d33a2fa90882a1e7eb26330', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'a58fc10adf503969fec2007b5afe8987258046c4', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '289a2ca0c9b7eae74f93fc213b0b971669b8683d', 'versionType': 'git'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'e144ad0250f77e23e28949587b8b57e40dc3b512', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'fb9b49618ed7296ebfad62a3835da8945f727001', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '78955fdce8ff654e6d33a2fa90882a1e7eb26330', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': 'a58fc10adf503969fec2007b5afe8987258046c4', 'versionType': 'git'}, {'status': 'affected', 'version': '6866d7b3f2bb4f011041ba54c98b1584497fe2fd', 'lessThan': '289a2ca0c9b7eae74f93fc213b0b971669b8683d', 'versionType': 'git'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/jbd2/journal.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d Added Reference https://git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 Added Reference https://git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 Added Reference https://git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330 Added Reference https://git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4 Added Reference https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512 Added Reference https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.