---
id: CVE-2026-89879
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: s2255: bound JPEG frame size before copying into the buffer

  s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG
  frame into the vb2 plane
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: s2255: bound JPEG frame size before copying into the buffer

  s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG
  frame into the vb2 plane.  vc…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    32a595dd3e8634544e5cfbc47f906dff3d3c1ef8
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    4b6f7bccc6559ae5c54573c284fe76eafc9989b2
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    2542516a147bfad740e7e411c251b639fad260ff
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    d2ecaaab6a4f165abb54cdf61be60030b5782bf8
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    68d664f1b4efe525e99154b7058fcb0378bdaff7
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    dd739517560c8d0ec4463a53e717bf40b988d7da
  - >-
    Linux >= 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 <
    e504cc888f42999dd76b6a43788c422610f2aad2
  - Linux 2.6.27
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:56.230'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89879'
references:
  - url: 'https://git.kernel.org/stable/c/2542516a147bfad740e7e411c251b639fad260ff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/32a595dd3e8634544e5cfbc47f906dff3d3c1ef8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4b6f7bccc6559ae5c54573c284fe76eafc9989b2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/68d664f1b4efe525e99154b7058fcb0378bdaff7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d2ecaaab6a4f165abb54cdf61be60030b5782bf8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dd739517560c8d0ec4463a53e717bf40b988d7da'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e504cc888f42999dd76b6a43788c422610f2aad2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.985Z'
epss: 0.00211
epssPercentile: 0.10105
---

## Overview

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

media: s2255: bound JPEG frame size before copying into the buffer

s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG
frame into the vb2 plane.  vc->jpg_size is taken verbatim from the
S2255_MARKER_FRAME header the device sends (pdword[4] in save_frame())
and, unlike the frame payload length just above it, is never bounded:

	payload = le32_to_cpu(pdword[3]);
	if (payload > vc->req_image_size)	/* payload is checked ... */
		return -EINVAL;
	vc->pkt_size = payload;
	vc->jpg_size = le32_to_cpu(pdword[4]);	/* ... jpg_size is not */

A malicious or malfunctioning device can therefore report a jpg_size
larger than the destination vb2 plane, and the memcpy() writes past it.
jpg_size is a signed int, so a value with the top bit set also turns
into a huge length.

Reject a frame whose jpg_size is negative or exceeds the plane size
before copying it.

## Remediation

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