---
id: CVE-2026-93078
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cxl/features: Reject Set Features output buffer smaller than the header

  cxlctl_set_feature() sizes its output buffer from the user's
  fwctl_rpc.out_len but never checks…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  cxl/features: Reject Set Features output buffer smaller than the header

  cxlctl_set_feature() sizes its output buffer from the user's
  fwctl_rpc.out_len but never checks…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 <
    1281dc84c81577b51e2b61c24617c9f44b2cdb99
  - >-
    Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 <
    16b7c99eff030c6ea11ca24efa4b9f989cc74093
  - >-
    Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 <
    cde18d6c1d913a67ab0afd3d9475ece4be79da50
  - Linux 6.15
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:18:01.743'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93078'
references:
  - url: 'https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.762Z'
epss: 0.00198
epssPercentile: 0.09843
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

cxl/features: Reject Set Features output buffer smaller than the header

cxlctl_set_feature() sizes its output buffer from the user's
fwctl_rpc.out_len but never checks it is large enough to hold even the
fwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns
ZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent
rpc_out->size = 0 then writes through the poison pointer.

Reject requests whose output buffer can't hold the response header,
before allocating. The Set Feature reply carries no payload, so the
header is all that is required.

## Remediation

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