CVE-2026-97916Hinoki check available

Out-of-bounds access via firmware log TOCTOU

Published Sep 25, 2026 · Updated Sep 25, 2026

A TOCTOU flaw in the Linux kernel 6.6 ivpu driver allows context-dependent attackers to trigger out-of-bounds host memory access. fw_log_from_bo validates header_size and size in a DMA-shared firmware log buffer, but fw_log_print_buffer rereads the mutable fields and dereferences addresses derived from changed values. Reachability requires NPU firmware to alter the shared metadata between validation and use; the published record establishes no user-controlled path or specific crash or disclosure outcome.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A TOCTOU flaw in the Linux kernel 6.6 ivpu driver allows context-dependent attackers to trigger out-of-bounds host memory access. fw_log_from_bo validates header_size and size in a DMA-shared firmware log buffer, but fw_log_print_buffer rereads the mutable fields and dereferences addresses derived from changed values. Reachability requires NPU firmware to alter the shared metadata between validation and use; the published record establishes no user-controlled path or specific crash or disclosure outcome.

The record

CVE
CVE-2026-97916
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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?

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

  1. Affected versionversion=6.6
  2. Affected versionversion=d4e4257afa6ed5205eda993180401fc2c20e4b60 <0724afc55c77c36c7feb9a7264b02aa7593c5c2d
  3. Affected versionversion=d4e4257afa6ed5205eda993180401fc2c20e4b60 <40868f80a89199630b03d4457876f9a1feba0660
  4. Affected versionversion=d4e4257afa6ed5205eda993180401fc2c20e4b60 <8ec3d6972f1440fae6c8dadd1859892775208759
  5. Affected versionversion=d4e4257afa6ed5205eda993180401fc2c20e4b60 <b1555f63ee1a680f280bc18e8dac416f250e2ec3

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=d4e4257afa6ed5205eda993180401fc2c20e4b60 <0724afc55c77c36c7feb9a7264b02aa7593c5c2d; version=d4e4257afa6ed5205eda993180401fc2c20e4b60 <40868f80a89199630b03d4457876f9a1feba0660; version=d4e4257afa6ed5205eda993180401fc2c20e4b60 <8ec3d6972f1440fae6c8dadd1859892775208759; version=d4e4257afa6ed5205eda993180401fc2c20e4b60 <b1555f63ee1a680f280bc18e8dac416f250e2ec3

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)
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.

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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