jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Summary
| CVE | CVE-2026-72225 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:21:41 UTC |
| Updated | 2026-08-23 13:16:41 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.001720000 probability, percentile 0.069530000 (date 2026-08-17)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd aa90f00932bf572d6ef284c977c2a60b39c13bd6 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd e144ad0250f77e23e28949587b8b57e40dc3b512 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd fb9b49618ed7296ebfad62a3835da8945f727001 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd 78955fdce8ff654e6d33a2fa90882a1e7eb26330 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd a58fc10adf503969fec2007b5afe8987258046c4 git | Not specified |
| CNA | Linux | Linux | affected 6866d7b3f2bb4f011041ba54c98b1584497fe2fd 289a2ca0c9b7eae74f93fc213b0b971669b8683d git | Not specified |
| CNA | Linux | Linux | affected 5.10 | Not specified |
| CNA | Linux | Linux | unaffected 5.10 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.266 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/aa90f00932bf572d6ef284c977c2a60b39c13bd6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.