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NVD / CVE Program· CNA Linux

CVE-2025-68237: mtdchar: fix integer overflow in read/write ioctls

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 37944f4f8199cd153fef74e95ca268020162f212, 457376c6fbf0c69326a9bf1f72416225f681192b, e4185bed738da755b191aa3f2e16e8b48450e1b8.

Low priority for now. Upgrade to Linux Linux 37944f4f8199cd153fef74e95ca268020162f212, 457376c6fbf0c69326a9bf1f72416225f681192b, e4185bed738da755b191aa3f2e16e8b48450e1b8 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: mtdchar: fix integer overflow in read/write ioctls The "req.start" and "req.len" variables are u64 values that come from the user at the start of the function. We mask away the high 32 bits of "req.len" so that's capped at U32_MAX but the "req.start" variable can go up to U64_MAX which means that the addition can still integer overflow. Use check_add_overflow() to fix this bug.

—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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.

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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

    • 5.17affected
    • 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 and later · before f37efdd97fd1ec3e0d0f1eec279c8279e28f981eaffected · git
    • 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 and later · before 457376c6fbf0c69326a9bf1f72416225f681192baffected · git
    • 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 and later · before eb9361484814fb12f3b7544b33835ea67d7a6a97affected · git
    • 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 and later · before 37944f4f8199cd153fef74e95ca268020162f212affected · git
    • 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 and later · before e4185bed738da755b191aa3f2e16e8b48450e1b8affected · git
    • before 5.17not affected · semver
    • 6.1.159 and later · up to and including 6.1.*not affected · semver
    • 6.6.118 and later · up to and including 6.6.*not affected · semver
    • 6.12.60 and later · up to and including 6.12.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.10-16.17.10-1

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-2025-68235Dec 16, 2025 · nouveau/firmware: Add missing kfree() of nvkm_falcon_fw::boot
    0Monitor
  • ← EarlierCVE-2025-68236Dec 16, 2025 · scsi: ufs: ufs-qcom: Fix UFS OCP issue during UFS power down (PC=3)
    0Monitor
  • Later →CVE-2025-68238Dec 16, 2025 · mtd: rawnand: cadence: fix DMA device NULL pointer dereference
    0Monitor

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 Linux37944f4f8199cd153fef74e95ca268020162f212Vendor (CNA)
Linux Linux457376c6fbf0c69326a9bf1f72416225f681192bVendor (CNA)
Linux Linuxe4185bed738da755b191aa3f2e16e8b48450e1b8Vendor (CNA)
Linux Linuxeb9361484814fb12f3b7544b33835ea67d7a6a97Vendor (CNA)
Linux Linuxf37efdd97fd1ec3e0d0f1eec279c8279e28f981eVendor (CNA)
debian:linux6.1.159-1 · 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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records