---
id: CVE-2023-54234
title: 'scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization

  Commit c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic")
  introduced an array mrioc->evtack_cmds…
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c1af985d27da2d530c22604644e9025810f57d7c <
    4e0dfdb48a824deac3dfbc67fb856ef2aee13529
  - >-
    Linux >= c1af985d27da2d530c22604644e9025810f57d7c <
    67989091e11a974003ddf2ec39bc613df8eadd83
  - >-
    Linux >= c1af985d27da2d530c22604644e9025810f57d7c <
    e39ea831ebad4ab15c4748cb62a397a8abcca36e
  - Linux 5.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:39:35.903233Z'
published: '2025-12-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:42.603Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-54234'
references:
  - url: 'https://git.kernel.org/stable/c/4e0dfdb48a824deac3dfbc67fb856ef2aee13529'
  - url: 'https://git.kernel.org/stable/c/67989091e11a974003ddf2ec39bc613df8eadd83'
  - url: 'https://git.kernel.org/stable/c/e39ea831ebad4ab15c4748cb62a397a8abcca36e'
tags:
  - cve.org
epss: 0.00148
epssPercentile: 0.03615
ingestedAt: '2026-10-15T22:48:25.435Z'
---

## Overview

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

scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization

Commit c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic")
introduced an array mrioc->evtack_cmds but initialization of the array
elements was missed. They are just zero cleared. The function
mpi3mr_complete_evt_ack() refers host_tag field of the elements. Due to the
zero value of the host_tag field, the function calls clear_bit() for
mrico->evtack_cmds_bitmap with wrong bit index. This results in memory
access to invalid address and "BUG: KASAN: use-after-free". This BUG was
observed at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add
the missing initialization of mrioc->evtack_cmds.

## Affected

- `Linux >= c1af985d27da2d530c22604644e9025810f57d7c < 4e0dfdb48a824deac3dfbc67fb856ef2aee13529`
- `Linux >= c1af985d27da2d530c22604644e9025810f57d7c < 67989091e11a974003ddf2ec39bc613df8eadd83`
- `Linux >= c1af985d27da2d530c22604644e9025810f57d7c < e39ea831ebad4ab15c4748cb62a397a8abcca36e`
- `Linux 5.17`

## Remediation

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