---
id: CVE-2026-64483
title: 'ALSA: firewire: isight: bound the sample count to the packet payload'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: firewire: isight: bound the sample count to the packet payload

  isight_packet() takes the frame count from the device iso packet and
  checks it only against the de…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    24423e0a9251d348c3f1fb0bb0e61b879e1e976c
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    ebbffacda6733dcbcef601b5b523460f8d8b671e
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    57e4d9043afc1eaddee8f50d11def6e65415d273
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    31da82b9676c6b112e7c72c7529e6812b919742a
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    8e48a29813df8dd71503800b7acf69c12c035045
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    31a01b70bb90e3ef3147f308e2ea899e1d2485ca
  - >-
    Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c <
    29b9667982e4df2ed7744f86b1144f8bb58eb698
  - Linux 3.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:40:04.650665Z'
published: '2026-07-25'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:44:55.003Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64483'
references:
  - url: 'https://git.kernel.org/stable/c/24423e0a9251d348c3f1fb0bb0e61b879e1e976c'
  - url: 'https://git.kernel.org/stable/c/ebbffacda6733dcbcef601b5b523460f8d8b671e'
  - url: 'https://git.kernel.org/stable/c/57e4d9043afc1eaddee8f50d11def6e65415d273'
  - url: 'https://git.kernel.org/stable/c/3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478'
  - url: 'https://git.kernel.org/stable/c/31da82b9676c6b112e7c72c7529e6812b919742a'
  - url: 'https://git.kernel.org/stable/c/8e48a29813df8dd71503800b7acf69c12c035045'
  - url: 'https://git.kernel.org/stable/c/31a01b70bb90e3ef3147f308e2ea899e1d2485ca'
  - url: 'https://git.kernel.org/stable/c/29b9667982e4df2ed7744f86b1144f8bb58eb698'
tags:
  - cve.org
epss: 0.00184
epssPercentile: 0.08085
ingestedAt: '2026-11-06T16:57:43.163Z'
---

## Overview

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

ALSA: firewire: isight: bound the sample count to the packet payload

isight_packet() takes the frame count from the device iso packet and
checks it only against the device claimed iso length.

	count = be32_to_cpu(payload->sample_count);
	if (likely(count <= (length - 16) / 4))
		isight_samples(isight, payload->samples, count);

length is the iso header data_length. It can be up to 0xffff. So the
gate allows a count up to about 16379. isight_samples() then copies
count frames out of payload->samples into the PCM DMA buffer.

payload->samples holds only 2 * MAX_FRAMES_PER_PACKET values. The
device multiplexes two samples per frame. A count past
MAX_FRAMES_PER_PACKET reads past the payload. A count past the buffer
size writes past runtime->dma_area. The smallest PCM buffer is larger
than MAX_FRAMES_PER_PACKET. Bounding the count to MAX_FRAMES_PER_PACKET
keeps both the read and the write in range.

A malicious or faulty Apple iSight on the FireWire bus reaches this
during a normal capture.

Add the MAX_FRAMES_PER_PACKET bound to the gate.

## Affected

- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 24423e0a9251d348c3f1fb0bb0e61b879e1e976c`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < ebbffacda6733dcbcef601b5b523460f8d8b671e`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 57e4d9043afc1eaddee8f50d11def6e65415d273`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31da82b9676c6b112e7c72c7529e6812b919742a`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 8e48a29813df8dd71503800b7acf69c12c035045`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31a01b70bb90e3ef3147f308e2ea899e1d2485ca`
- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 29b9667982e4df2ed7744f86b1144f8bb58eb698`
- `Linux 3.0`

## Remediation

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