CVE-2026-64085

Kernel memory corruption via oversized blackbox record

Published Jul 19, 2026 · Updated Jul 19, 2026

An out-of-bounds write in the Linux kernel ADM1266 hwmon driver allows local users to corrupt kernel memory through a long blackbox response. adm1266_pmbus_block_xfer() trusts the device-supplied byte count and writes as many as 255 bytes into a 64-byte dev_mem record slot before adm1266_nvmem_read_blackbox() rejects the length. Reachability requires local access and an ADM1266 chip; published sources characterize no outcome beyond kernel-memory corruption.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Linux kernel ADM1266 hwmon driver allows local users to corrupt kernel memory through a long blackbox response. adm1266_pmbus_block_xfer() trusts the device-supplied byte count and writes as many as 255 bytes into a 64-byte dev_mem record slot before adm1266_nvmem_read_blackbox() rejects the length. Reachability requires local access and an ADM1266 chip; published sources characterize no outcome beyond kernel-memory corruption.

The record

CVE
CVE-2026-64085
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-120
Attack vector
local
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=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <43cae21424ff8e33894a0f86c6b80b840c049fd7
  2. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <6098634cfa711f11a8d65368dc51ec8f7c8241ba
  3. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <60c4b9fe1a3dd012014b1f561a6928a0b5db1126
  4. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <7896d87cbb05e097efc113243d4e38f9f8cea16c
  5. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <83e039f0a43e0708515b0479cb7690fb93faaaa0
  6. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f
  7. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <9d5309500b4607b7198e19f0a3fa13eb864cd5fb
  8. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <dd47b8c4a0a8ced442da3f008db28fbbd31feaf0
  9. Affected versionversion=5.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <43cae21424ff8e33894a0f86c6b80b840c049fd7; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <6098634cfa711f11a8d65368dc51ec8f7c8241ba; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <60c4b9fe1a3dd012014b1f561a6928a0b5db1126; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <7896d87cbb05e097efc113243d4e38f9f8cea16c; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <83e039f0a43e0708515b0479cb7690fb93faaaa0; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <9d5309500b4607b7198e19f0a3fa13eb864cd5fb; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <dd47b8c4a0a8ced442da3f008db28fbbd31feaf0; 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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