mtd: ubi: Release device reference on busy detach (CVE-2026-90215) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90215

mtd: ubi: Release device reference on busy detach

Answer in brief

CVE-2026-90215 records a Unknown severity vulnerability in mtd: ubi: Release device reference on busy detach. 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	>=7e84c961b2eb062d2f47037dcca52dcd1d3615b5 <87812858c4c8df979cb70bcd0040b925a543df6f \|\| >=7e84c961b2eb062d2f47037dcca52dcd1d3615b5 <e065960366b55ab21e6c643c30dec2a41451900b \|\| >=7e84c961b2eb062d2f47037dcca52dcd1d3615b5 <851c5e9a829d56cb0982965f07ef8966a6722884 \|\| >=7e84c961b2eb062d2f47037dcca52dcd1d3615b5 <31dd710cd84d5dd63c49f640d3a9f36c9699ca95	87812858c4c8df979cb70bcd0040b925a543df6f, e065960366b55ab21e6c643c30dec2a41451900b, 851c5e9a829d56cb0982965f07ef8966a6722884, 31dd710cd84d5dd63c49f640d3a9f36c9699ca95
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 87812858c4c8df979cb70bcd0040b925a543df6f 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: mtd: ubi: Release device reference on busy detach ubi_detach_mtd_dev() obtains a device reference through ubi_get_device() before checking whether the UBI device is busy. The busy return path drops ubi->ref_count but leaves the device reference held, so the device object cannot be released after a later detach. Drop the device reference before returning -EBUSY.

Quoted source text, attributed separately from HOL analysis.