ksmbd: zero pipe read compound padding

Answer in brief

CVE-2026-89794 records a Unknown severity vulnerability in ksmbd: zero pipe read compound padding. 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 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 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	>=e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d <f188a400dd5285fec5a84548fe8dca49eee01155 \|\| >=e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d <d83a9de7cecd401c3d3e00ed6371194dcd7313e4 \|\| >=e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d <be15b8da4a82cf1e1f9880b2661b90770606eec1 \|\| >=e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d <73f860489e3be2245598d1819226304fc5b87291 \|\| f2283680a80571ca82d710bc6ecd8f8beac67d63 \|\| 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 \|\| >=5.15.145 <5.16 \|\| >=6.1.71 <6.2	f188a400dd5285fec5a84548fe8dca49eee01155, d83a9de7cecd401c3d3e00ed6371194dcd7313e4, be15b8da4a82cf1e1f9880b2661b90770606eec1, 73f860489e3be2245598d1819226304fc5b87291, 5.16, 6.2
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to f188a400dd5285fec5a84548fe8dca49eee01155 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: zero pipe read compound padding Compound response handling extends the last response iov to an eight-byte boundary. smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory. Allocate the aligned size and clear the unused tail before pinning the response buffer.

Quoted source text, attributed separately from HOL analysis.