---
id: CVE-2026-31464
title: 'scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

  A malicious or compromised VIO server can return a num_written value in the
  discover targets MAD respons…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    d842348f8a00d5b1d7358f207eb34ffcf5b16df3
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    a007246cb6c9ebdc93dafbf63cc2d43d98f402cc
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    4ed727e35b0ab17d3eeeb1e8023768396e2be161
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    d1466bf991b2343cf2ba8336e440c8faf3cbb780
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    786f10b1966e485046839f992e89f2c18cbd1983
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    bae4df0a643fa7f84663473aa3082a9c2ed139db
  - >-
    Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 <
    61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f
  - Linux 2.6.27
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:09:42.415310Z'
published: '2026-04-22'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:11.762Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31464'
references:
  - url: 'https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3'
  - url: 'https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc'
  - url: 'https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89'
  - url: 'https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161'
  - url: 'https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780'
  - url: 'https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983'
  - url: 'https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db'
  - url: 'https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f'
tags:
  - cve.org
epss: 0.00419
epssPercentile: 0.34712
ingestedAt: '2026-10-16T17:24:46.655Z'
---

## Overview

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

scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

A malicious or compromised VIO server can return a num_written value in the
discover targets MAD response that exceeds max_targets. This value is
stored directly in vhost->num_targets without validation, and is then used
as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which
is only allocated for max_targets entries. Indices at or beyond max_targets
access kernel memory outside the DMA-coherent allocation.  The
out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI
MADs that are sent back to the VIO server, leaking kernel memory.

Fix by clamping num_written to max_targets before storing it.

## Affected

- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d842348f8a00d5b1d7358f207eb34ffcf5b16df3`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 4ed727e35b0ab17d3eeeb1e8023768396e2be161`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d1466bf991b2343cf2ba8336e440c8faf3cbb780`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 786f10b1966e485046839f992e89f2c18cbd1983`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < bae4df0a643fa7f84663473aa3082a9c2ed139db`
- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f`
- `Linux 2.6.27`

## Remediation

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