CVE-2026-64490: ALSA: virtio: Validate control metadata from the device
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 gv2atypemap[] in virtsndkctlinfo(), and to size loops and memcpy() operations in virtsndkctlget() and virtsndkctlput() against fixed-size virtiosndctlvalue and sndctlelemvalue 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 virtsndkctlparsecfg(), before querying enumerated items or exposing the control to ALSA.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64490?
CVE-2026-64490 has a severity rating of 8.4, categorized as high.
What type of vulnerability is CVE-2026-64490?
CVE-2026-64490 is a vulnerability in the Linux kernel related to the validation of control metadata from the ALSA virtio-snd device.
How does CVE-2026-64490 impact system security?
CVE-2026-64490 can allow an attacker to manipulate device control metadata leading to potential denial of service or privilege escalation.
How do I fix CVE-2026-64490?
To fix CVE-2026-64490, update your Linux kernel to the latest version that includes a patch for this vulnerability.
What systems are affected by CVE-2026-64490?
CVE-2026-64490 affects systems running the vulnerable versions of the Linux kernel that use ALSA virtio sound drivers.