Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-72225: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 289a2ca0c9b7eae74f93fc213b0b971669b8683d, 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9, 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6.

Low priority for now. Upgrade to Linux Linux 289a2ca0c9b7eae74f93fc213b0b971669b8683d, 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9, 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-72225

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.10affected
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before aa90f00932bf572d6ef284c977c2a60b39c13bd6affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before e144ad0250f77e23e28949587b8b57e40dc3b512affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before fb9b49618ed7296ebfad62a3835da8945f727001affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before 78955fdce8ff654e6d33a2fa90882a1e7eb26330affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before a58fc10adf503969fec2007b5afe8987258046c4affected · git
    • 6866d7b3f2bb4f011041ba54c98b1584497fe2fd and later · before 289a2ca0c9b7eae74f93fc213b0b971669b8683daffected · git
    • before 5.10not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-72223Aug 15, 2026 · nvdimm/btt: Free arena sub-allocations on discover_arenas() error path
    0Monitor
  • ← EarlierCVE-2026-72224Aug 15, 2026 · nvdimm/btt: Free arenas on btt_init() error paths
    0Monitor
  • Later →CVE-2026-72226Aug 15, 2026 · batman-adv: tt: prevent TVLV OOB check overflow
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux289a2ca0c9b7eae74f93fc213b0b971669b8683dVendor (CNA)
Linux Linux4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9Vendor (CNA)
Linux Linux4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6Vendor (CNA)
Linux Linux78955fdce8ff654e6d33a2fa90882a1e7eb26330Vendor (CNA)
Linux Linuxa58fc10adf503969fec2007b5afe8987258046c4Vendor (CNA)
Linux Linuxaa90f00932bf572d6ef284c977c2a60b39c13bd6Vendor (CNA)
Linux Linuxe144ad0250f77e23e28949587b8b57e40dc3b512Vendor (CNA)
Linux Linuxfb9b49618ed7296ebfad62a3835da8945f727001Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records