High [CVE-2026-64490] Validate control metadata from the device
This high-severity Red Hat Linux advisory covers CVE-2026-64490 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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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.
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.
The driver's control handling trusts this unvalidated metadata, leading to out-of-bounds access when processing sound control information. This vulnerability could allow a malicious device to cause a denial of service or potentially other impacts on the system.
This represents a device-to-guest attack surface rather than a network- or packet-reachable vulnerability. Exploitation requires control over a virtio-snd device or its backend in order to provide crafted control metadata to the guest kernel.
An ordinary unprivileged local user inside the guest cannot directly supply the required malicious metadata through normal ALSA interfaces.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
- kernel-0:6.12.0-211.50.1.el10_2
- kernel-0:5.14.0-687.44.1.el9_8
- RHSA-2026:61887
- RHSA-2026:63129
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation checklist
- To mitigate this issue, prevent module virtio_snd from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
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