firmware: arm_scmi: Unwind TX receiver mailbox setup failure (CVE-2026-93083) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93083

firmware: arm_scmi: Unwind TX receiver mailbox setup failure

Answer in brief

CVE-2026-93083 records a Unknown severity vulnerability in firmware: arm_scmi: Unwind TX receiver mailbox setup failure. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1 <babb017cf5e4600c94c23ea87175a0380235a3ee \|\| >=9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1 <717b8e972a667fc1bebe63cbcf0d58e692cbb491 \|\| >=9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1 <9958f55eace8b43713c9fc54dcf90e7cdefee413 \|\| >=9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1 <6f7c06744d53dc8e047725d411d7f915d9ec35ae	babb017cf5e4600c94c23ea87175a0380235a3ee, 717b8e972a667fc1bebe63cbcf0d58e692cbb491, 9958f55eace8b43713c9fc54dcf90e7cdefee413, 6f7c06744d53dc8e047725d411d7f915d9ec35ae
Linux/Linuxgeneric	6.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to babb017cf5e4600c94c23ea87175a0380235a3ee if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Unwind TX receiver mailbox setup failure mailbox_chan_setup() can request an additional unidirectional TX receiver channel after successfully acquiring the primary channel. If that second request fails, the function returns immediately and leaves the primary channel allocated. Unwind the primary mailbox channel before returning the error so probe deferral or other setup failures do not leave the channel busy for later probe attempts.

Quoted source text, attributed separately from HOL analysis.