---
id: CVE-2026-93079
title: |-
  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 …
summary: |-
  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 …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5908f3ed6dc209e5c824e63afda7545805f75a7e <
    3f02031a0a53de0d3ef066c92d0486b2b11be40c
  - >-
    Linux >= 5908f3ed6dc209e5c824e63afda7545805f75a7e <
    329ea475581c647a680a6937e353c1a6e2534b40
  - >-
    Linux >= 5908f3ed6dc209e5c824e63afda7545805f75a7e <
    4bf6bac375076ced2fa4b3fef8739bd985f93456
  - Linux 6.15
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:20.330'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93079'
references:
  - url: 'https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00161
epssPercentile: 0.05769
ingestedAt: '2026-09-17T16:21:47.762Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.