---
id: CVE-2026-89730
title: 'fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write

  The trailing byte path in altera_cvp_send_block() dereferences a u32
  pointer even when only 1-3 bytes…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    447b3c893987a0106a65f04b62ec3271892e9d98
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    3b8938f5fbcf4a918785f9cb4b108782eb4ea717
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    2564ac3d3b8b47cd9692a5bf42d668ed7218b54e
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    8f3365ed2a5db2ac95ab70a6c47561db39d24537
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    b138bc665e21d4422382ab43aebdf0a2b7bb9cb3
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    827ec385458adeeda651de2b6f3537e386b1a8d9
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    4dc1051939e499c838229af035464a5fc7671198
  - >-
    Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 <
    9da70a43b5fea60d758137f7f0ccfe19356cb5bb
  - Linux 4.14
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:51:43.578Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89730'
references:
  - url: 'https://git.kernel.org/stable/c/447b3c893987a0106a65f04b62ec3271892e9d98'
  - url: 'https://git.kernel.org/stable/c/3b8938f5fbcf4a918785f9cb4b108782eb4ea717'
  - url: 'https://git.kernel.org/stable/c/2564ac3d3b8b47cd9692a5bf42d668ed7218b54e'
  - url: 'https://git.kernel.org/stable/c/8f3365ed2a5db2ac95ab70a6c47561db39d24537'
  - url: 'https://git.kernel.org/stable/c/b138bc665e21d4422382ab43aebdf0a2b7bb9cb3'
  - url: 'https://git.kernel.org/stable/c/827ec385458adeeda651de2b6f3537e386b1a8d9'
  - url: 'https://git.kernel.org/stable/c/4dc1051939e499c838229af035464a5fc7671198'
  - url: 'https://git.kernel.org/stable/c/9da70a43b5fea60d758137f7f0ccfe19356cb5bb'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89730.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89730'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532368'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89730'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89730'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89730.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00216
epssPercentile: 0.12005
ingestedAt: '2026-09-14T15:23:07.449Z'
---

## Overview

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

fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write

The trailing byte path in altera_cvp_send_block() dereferences a u32
pointer even when only 1-3 bytes remain in the input buffer. If the buffer
ends at a page or scatterlist boundary, this can read past the valid image
data and fault.

Copy the remaining bytes into a zero-initialized u32 before writing the
final word so only valid bytes are read from the input buffer.

## Affected

- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 447b3c893987a0106a65f04b62ec3271892e9d98`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 3b8938f5fbcf4a918785f9cb4b108782eb4ea717`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 2564ac3d3b8b47cd9692a5bf42d668ed7218b54e`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 8f3365ed2a5db2ac95ab70a6c47561db39d24537`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < b138bc665e21d4422382ab43aebdf0a2b7bb9cb3`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 827ec385458adeeda651de2b6f3537e386b1a8d9`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 4dc1051939e499c838229af035464a5fc7671198`
- `Linux >= 34d1dc17ce978ae76e676d401b48fe9d004aa948 < 9da70a43b5fea60d758137f7f0ccfe19356cb5bb`
- `Linux 4.14`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89730.json)