cxl/features: Reject Get Feature count larger than the output buffer (CVE-2026-93079) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93079

cxl/features: Reject Get Feature count larger than the output buffer

Answer in brief

CVE-2026-93079 records a Unknown severity vulnerability in cxl/features: Reject Get Feature count larger than the output buffer. 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	>=5908f3ed6dc209e5c824e63afda7545805f75a7e <3f02031a0a53de0d3ef066c92d0486b2b11be40c \|\| >=5908f3ed6dc209e5c824e63afda7545805f75a7e <329ea475581c647a680a6937e353c1a6e2534b40 \|\| >=5908f3ed6dc209e5c824e63afda7545805f75a7e <4bf6bac375076ced2fa4b3fef8739bd985f93456	3f02031a0a53de0d3ef066c92d0486b2b11be40c, 329ea475581c647a680a6937e353c1a6e2534b40, 4bf6bac375076ced2fa4b3fef8739bd985f93456
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3f02031a0a53de0d3ef066c92d0486b2b11be40c 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: cxl/features: Reject Get Feature count larger than the output buffer cxlctl_get_feature() sizes its output buffer from the user's fwctl_rpc.out_len, but the device is told to write cxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a separate user-controlled value. Nothing bounds count against out_len, so a small out_len with a large count overflows the kvzalloc()'d buffer. A heap OOB write reachable from FWCTL_RPC. Reject requests where count exceeds the available payload room, before allocating.

Quoted source text, attributed separately from HOL analysis.