CVE-2026-64086

Kernel memory corruption via undersized PMBus buffer

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds access in the Linux Kernel ADM1266 PMBus driver allows local users to corrupt kernel memory via a 255-byte block reply. adm1266_pmbus_block_xfer directs 257 bytes into a 256-byte read_buf and then indexes beyond that array during PEC comparison. Reachability requires ADM1266 hardware, control of its I2C reply, and access to a local debugfs or nvmem path; impact includes kernel panic, hang, or code execution.

CVSS severity7.8
High
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

Out-of-bounds access in the Linux Kernel ADM1266 PMBus driver allows local users to corrupt kernel memory via a 255-byte block reply. adm1266_pmbus_block_xfer directs 257 bytes into a 256-byte read_buf and then indexes beyond that array during PEC comparison. Reachability requires ADM1266 hardware, control of its I2C reply, and access to a local debugfs or nvmem path; impact includes kernel panic, hang, or code execution.

The record

CVE
CVE-2026-64086
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

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 <2279c342d94eca225bf9f301c8806a05a1c81619
  2. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <397d3f523bfff2f4e3dacf9b1339bd76dc207f78
  3. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <472744f69d25a2d5111ad62f1d62579dce2c13c8
  4. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <487566cb1ccdf3756fdd7bf8d875e612ff3169bb
  5. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <528a9f88e88502d0c2f2052a279415074cd83715
  6. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <a6c802145a8de0830bca803c6d415f7e9e683624
  7. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694
  8. Affected versionversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <d94ceb16e55b6d8019ab069e357c76ac42f0ffbc
  9. Affected versionversion=5.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <2279c342d94eca225bf9f301c8806a05a1c81619; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <397d3f523bfff2f4e3dacf9b1339bd76dc207f78; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <472744f69d25a2d5111ad62f1d62579dce2c13c8; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <487566cb1ccdf3756fdd7bf8d875e612ff3169bb; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <528a9f88e88502d0c2f2052a279415074cd83715; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <a6c802145a8de0830bca803c6d415f7e9e683624; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694; version=407dc802a9c0809ca6a48de4b4c63305eb84ef56 <d94ceb16e55b6d8019ab069e357c76ac42f0ffbc; version=5.10

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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