ipmi: ipmb: validate write message length

Answer in brief

CVE-2026-81007 records a Unknown severity vulnerability in ipmi: ipmb: validate write message length. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=51bd6f291583684f495ea498984dfc22049d7fd2 <60939bcda6f3f104ef456fdbf3cc5733c0720fb1 \|\| >=51bd6f291583684f495ea498984dfc22049d7fd2 <5719431ca2b5fa26560bb38f6202f8b97fa3bbb0 \|\| >=51bd6f291583684f495ea498984dfc22049d7fd2 <a84c6e3d188f2c6e674910929eb790634299d6d5 \|\| >=51bd6f291583684f495ea498984dfc22049d7fd2 <53637506884dbd5c91a89b1a3547d99d80f8ed2c	60939bcda6f3f104ef456fdbf3cc5733c0720fb1, 5719431ca2b5fa26560bb38f6202f8b97fa3bbb0, a84c6e3d188f2c6e674910929eb790634299d6d5, 53637506884dbd5c91a89b1a3547d99d80f8ed2c
Linux/Linuxgeneric	5.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 60939bcda6f3f104ef456fdbf3cc5733c0720fb1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ipmi: ipmb: validate write message length ipmb_write() read message fields before validating the length byte. A zero or short write can read uninitialized stack bytes. A length smaller than the SMBus header underflows the block write length. Require a non-empty buffer and the minimum IPMB request length. Also require the length byte plus payload before parsing the message.

Quoted source text, attributed separately from HOL analysis.