CVE-2026-64087

Kernel memory corruption via unchecked record count

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds write in the Linux Kernel ADM1266 hwmon driver allows a malformed PMBus response to corrupt kernel memory during blackbox reads. adm1266_nvmem_read_blackbox() trusts byte 3 of BLACKBOX_INFO as record_count and iterates beyond the 32-record data->dev_mem allocation. Reachability requires an ADM1266 device and a blackbox read; firmware faults, bus corruption, or a nonresponsive slave can supply the oversized count, with no reported code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux Kernel ADM1266 hwmon driver allows a malformed PMBus response to corrupt kernel memory during blackbox reads. adm1266_nvmem_read_blackbox() trusts byte 3 of BLACKBOX_INFO as record_count and iterates beyond the 32-record data->dev_mem allocation. Reachability requires an ADM1266 device and a blackbox read; firmware faults, bus corruption, or a nonresponsive slave can supply the oversized count, with no reported code execution.

The record

CVE
CVE-2026-64087
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=15609d1893020436e1e8ccfd9ded774a96dd17a2 <0e791cd0140fb136083565aadfbe0f705aa260d0
  2. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <231db52a5b64d0a9769e298dadc148e1f79b26a6
  3. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <4afca954622d672ea65ed961bed01cf91caa034e
  4. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <5469e1e7c411acc15fdd8262c99c3ebd9defd594
  5. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <75c862adf3d3caab4f49bb3530723c215376e37c
  6. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <adcb163ad7cacca317872fc62bd8885e842e45e3
  7. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <c2c56092710fe8a893b67b5a3d7e62808d02d84d
  8. Affected versionversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <f85c81e93dbd6915970bd5f3bffcf62633c4c54c
  9. Affected versionversion=5.10

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15609d1893020436e1e8ccfd9ded774a96dd17a2 <0e791cd0140fb136083565aadfbe0f705aa260d0; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <231db52a5b64d0a9769e298dadc148e1f79b26a6; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <4afca954622d672ea65ed961bed01cf91caa034e; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <5469e1e7c411acc15fdd8262c99c3ebd9defd594; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <75c862adf3d3caab4f49bb3530723c215376e37c; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <adcb163ad7cacca317872fc62bd8885e842e45e3; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <c2c56092710fe8a893b67b5a3d7e62808d02d84d; version=15609d1893020436e1e8ccfd9ded774a96dd17a2 <f85c81e93dbd6915970bd5f3bffcf62633c4c54c; version=5.10

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

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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.

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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