firmware: arm_scmi: Reject out of range DT protocol IDs (CVE-2026-93085) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93085

firmware: arm_scmi: Reject out of range DT protocol IDs

Answer in brief

CVE-2026-93085 records a Unknown severity vulnerability in firmware: arm_scmi: Reject out of range DT protocol IDs. 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	>=05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 <8eb2ab209570526728b35e39c4aecdb5099fbaf7 \|\| >=05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 <5142fd31bd8c9aff9bad4f6e0cc20e9574f2cee1 \|\| >=05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 <e66756313d1b4eadd13f39a0aee9fc8773d4d375 \|\| >=05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 <0b6e59eb885f985a5ea7beed385adfa9412b324d \|\| >=05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 <59407ccb52130f2c81f4b3cbe4f14114afceb54f	8eb2ab209570526728b35e39c4aecdb5099fbaf7, 5142fd31bd8c9aff9bad4f6e0cc20e9574f2cee1, e66756313d1b4eadd13f39a0aee9fc8773d4d375, 0b6e59eb885f985a5ea7beed385adfa9412b324d, 59407ccb52130f2c81f4b3cbe4f14114afceb54f
Linux/Linuxgeneric	6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8eb2ab209570526728b35e39c4aecdb5099fbaf7 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: Reject out of range DT protocol IDs SCMI protocol IDs carried in message headers are limited by MSG_PROTOCOL_ID_MASK. The DT parsing paths noticed protocol IDs outside that range, but only logged an error and then kept processing the invalid value. That lets a malformed 32-bit DT reg value reach helpers which take a u8 protocol ID, where it can be truncated and/or treated as a different protocol. For channel setup, two different out-of-range values can also be used as distinct IDR keys while aliasing the generated SCMI protocol identity. Skip DT protocol nodes whose reg value does not fit the SCMI protocol ID field before setting up channels or creating protocol devices.

Quoted source text, attributed separately from HOL analysis.