CVE-2026-81007

Local stack-data disclosure via short IPMB writes

Published Sep 11, 2026 · Updated Sep 11, 2026

Uninitialized-memory use in Linux kernel 5.3 and affected later branches allows local users to expose stack data through short IPMB writes. The ipmb_write() path reads the length, responder address, and network-function fields before verifying that the user buffer contains them, and a length below the SMBus header underflows the block length. Reachability requires local access to an instantiated IPMB device on suitable I2C hardware; the bounded impact is disclosure of uninitialized kernel-stack bytes onto the management bus.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Uninitialized-memory use in Linux kernel 5.3 and affected later branches allows local users to expose stack data through short IPMB writes. The ipmb_write() path reads the length, responder address, and network-function fields before verifying that the user buffer contains them, and a length below the SMBus header underflows the block length. Reachability requires local access to an instantiated IPMB device on suitable I2C hardware; the bounded impact is disclosure of uninitialized kernel-stack bytes onto the management bus.

The record

CVE
CVE-2026-81007
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=51bd6f291583684f495ea498984dfc22049d7fd2 <53637506884dbd5c91a89b1a3547d99d80f8ed2c
  2. Affected versionversion=51bd6f291583684f495ea498984dfc22049d7fd2 <5719431ca2b5fa26560bb38f6202f8b97fa3bbb0
  3. Affected versionversion=51bd6f291583684f495ea498984dfc22049d7fd2 <60939bcda6f3f104ef456fdbf3cc5733c0720fb1
  4. Affected versionversion=51bd6f291583684f495ea498984dfc22049d7fd2 <a84c6e3d188f2c6e674910929eb790634299d6d5
  5. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=51bd6f291583684f495ea498984dfc22049d7fd2 <53637506884dbd5c91a89b1a3547d99d80f8ed2c; version=51bd6f291583684f495ea498984dfc22049d7fd2 <5719431ca2b5fa26560bb38f6202f8b97fa3bbb0; version=51bd6f291583684f495ea498984dfc22049d7fd2 <60939bcda6f3f104ef456fdbf3cc5733c0720fb1; version=51bd6f291583684f495ea498984dfc22049d7fd2 <a84c6e3d188f2c6e674910929eb790634299d6d5; version=5.3

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.

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

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
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo