CVE-2026-98143Hinoki check available

U65 NPU workload interruption via rounding-mode misinterpretation

Published Sep 25, 2026 · Updated Sep 25, 2026

Incorrect field interpretation in the Linux Ethos-U driver allows local users to disrupt U65 NPU workloads through crafted command streams. The feat_matrix_length function shifts bits 15:14 of the precision field into a storage-mode value even though those bits encode rounding mode on U65 hardware. Natural rounding makes CMDSTREAM_BO_CREATE reject valid work with EINVAL, while truncating rounding selects a two-tile path and calculates a bogus feature-map size; exploitation requires a U65 NPU and an affected rounding mode.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect field interpretation in the Linux Ethos-U driver allows local users to disrupt U65 NPU workloads through crafted command streams. The feat_matrix_length function shifts bits 15:14 of the precision field into a storage-mode value even though those bits encode rounding mode on U65 hardware. Natural rounding makes CMDSTREAM_BO_CREATE reject valid work with EINVAL, while truncating rounding selects a two-tile path and calculates a bogus feature-map size; exploitation requires a U65 NPU and an affected rounding mode.

The record

CVE
CVE-2026-98143
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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?

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  1. Affected versionversion=5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b <6b08adbda8ea797849e3654ce12cb3856ce6051a
  2. Affected versionversion=5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b <db9deec5a345abc538d081fb221dc0b00a9695bd
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b <6b08adbda8ea797849e3654ce12cb3856ce6051a; version=5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b <db9deec5a345abc538d081fb221dc0b00a9695bd; version=6.19

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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