---
id: CVE-2026-64490
title: 'ALSA: virtio: Validate control metadata from the device'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: virtio: Validate control metadata from the device

  virtio-snd control handling trusts the device-provided control type and
  value count returned by the device.

  Th…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 <
    3243563f99ef5d3949b934bd6390a5679405d0e1
  - >-
    Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 <
    5da9742de22db0dbaa8d414214ab5e1bedde00f9
  - >-
    Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 <
    21584672fd699abe1768241d6c501b2de6139b6a
  - >-
    Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 <
    c77a6cbb36ff8cbc1f084d94f8dcda5250935271
  - Linux 6.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:41:24.261293Z'
published: '2026-07-25'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T20:48:37.167Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64490'
references:
  - url: 'https://git.kernel.org/stable/c/3243563f99ef5d3949b934bd6390a5679405d0e1'
  - url: 'https://git.kernel.org/stable/c/5da9742de22db0dbaa8d414214ab5e1bedde00f9'
  - url: 'https://git.kernel.org/stable/c/21584672fd699abe1768241d6c501b2de6139b6a'
  - url: 'https://git.kernel.org/stable/c/c77a6cbb36ff8cbc1f084d94f8dcda5250935271'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64490.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64490'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507277'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64490'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64490'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072550-CVE-2026-64490-72f5@gregkh/T
  - url: 'https://access.redhat.com/errata/RHSA-2026:83707'
  - url: 'https://access.redhat.com/errata/RHSA-2026:61887'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63129'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00193
epssPercentile: 0.08897
patched:
  - enterprise_linux_appstream_eus_v_10_0
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_eus_v_10_0
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_eus_v_10_0
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_real_time_for_nfv_eus_v_10_0
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_eus_v_10_0
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
scores:
  cna: 8.4
  vendor: 7
ingestedAt: '2026-10-16T17:24:46.824Z'
---

## Overview

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

ALSA: virtio: Validate control metadata from the device

virtio-snd control handling trusts the device-provided control type and
value count returned by the device.

That metadata is then used directly to index g_v2a_type_map[] in
virtsnd_kctl_info(), and to size loops and memcpy() operations in
virtsnd_kctl_get() and virtsnd_kctl_put() against fixed-size
virtio_snd_ctl_value and snd_ctl_elem_value arrays.

A buggy or malicious device can therefore trigger out-of-bounds access by
advertising an invalid control type or an oversized value count.

Validate control type and count once in virtsnd_kctl_parse_cfg(), before
querying enumerated items or exposing the control to ALSA.

## Affected

- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 3243563f99ef5d3949b934bd6390a5679405d0e1`
- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 5da9742de22db0dbaa8d414214ab5e1bedde00f9`
- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 21584672fd699abe1768241d6c501b2de6139b6a`
- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < c77a6cbb36ff8cbc1f084d94f8dcda5250935271`
- `Linux 6.9`

## Remediation

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

## Vendor advisories

- **RHSA-2026:83707** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-10-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:83707)
- **RHSA-2026:61887** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:61887)
- **RHSA-2026:63129** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63129)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64490.json)