CVE-2025-68751

False KMSAN alert via undersized store instrumentation

Published Jan 5, 2026 · Updated Jan 5, 2026

False-positive KMSAN reporting in affected Linux Kernel builds allows local users running ping to trigger an uninitialized-value alert. The s390 fpu_vstl() inline assembly can write more than one byte when index is positive, but Clang instruments only a one-byte store from compile-time constraints. Reachability requires an s390 kernel built with KMSAN and the relevant ping path; the result is a spurious diagnostic rather than data exposure, memory corruption, or service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

False-positive KMSAN reporting in affected Linux Kernel builds allows local users running ping to trigger an uninitialized-value alert. The s390 fpu_vstl() inline assembly can write more than one byte when index is positive, but Clang instruments only a one-byte store from compile-time constraints. Reachability requires an s390 kernel built with KMSAN and the relevant ping path; the result is a spurious diagnostic rather than data exposure, memory corruption, or service interruption.

The record

CVE
CVE-2025-68751
Published
Jan 5, 2026
Updated
Jan 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.9
  2. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <13dcd6308cb8f67134ee5d5d762b2a66363c695b
  3. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <14e4e4175b64dd9216b522f6ece8af6997d063b2
  4. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <946357a538bb47740635c25520924351d2d91544

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.9; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <13dcd6308cb8f67134ee5d5d762b2a66363c695b; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <14e4e4175b64dd9216b522f6ece8af6997d063b2; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <946357a538bb47740635c25520924351d2d91544

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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