---
id: CVE-2026-64134
title: 'ALSA: pcm: Don''t setup bogus iov_iter for silencing'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: pcm: Don't setup bogus iov_iter for silencing

  At transition to the iov_iter for PCM data transfer, we blindly
  applied the iov_iter setup also for silencing (i.e.…
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 >= cf393babb37a1679a1ec1d864df1090353465e23 <
    41a766c647294842c9b17672449f8e011048cba9
  - >-
    Linux >= cf393babb37a1679a1ec1d864df1090353465e23 <
    ce836587e594af39ff048d9b29dee0f5f10692c9
  - >-
    Linux >= cf393babb37a1679a1ec1d864df1090353465e23 <
    feff0251386aa6bb180a0a1cf7c1f91ba868113d
  - >-
    Linux >= cf393babb37a1679a1ec1d864df1090353465e23 <
    c9f6768515818d71bdfc20119a81f3332c53b9c6
  - >-
    Linux >= cf393babb37a1679a1ec1d864df1090353465e23 <
    e4d3386b74fba8e01280484b67ee481ece00201e
  - Linux 6.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:36:56.282680Z'
published: '2026-07-19'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:24.708Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64134'
references:
  - url: 'https://git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9'
  - url: 'https://git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9'
  - url: 'https://git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d'
  - url: 'https://git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6'
  - url: 'https://git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e'
tags:
  - cve.org
epss: 0.00129
epssPercentile: 0.02219
ingestedAt: '2026-10-16T17:24:46.807Z'
---

## Overview

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

ALSA: pcm: Don't setup bogus iov_iter for silencing

At transition to the iov_iter for PCM data transfer, we blindly
applied the iov_iter setup also for silencing (i.e. data = NULL), and
it leads to a calculation of bogus iov_iter.  Fortunately this didn't
cause troubles on most of architectures but it goes wrong on RISC-V
now, causing a NULL dereference.

Handle the NULL data case to treat the silencing in interleaved_copy()
for addressing the bug above.  noninterleaved_copy() has already the
NULL data handling, so it doesn't need changes.

## Affected

- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < 41a766c647294842c9b17672449f8e011048cba9`
- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < ce836587e594af39ff048d9b29dee0f5f10692c9`
- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < feff0251386aa6bb180a0a1cf7c1f91ba868113d`
- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < c9f6768515818d71bdfc20119a81f3332c53b9c6`
- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < e4d3386b74fba8e01280484b67ee481ece00201e`
- `Linux 6.6`

## Remediation

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