Out-of-bounds read in Linux kernel - CVE-2026-64490
Published: July 27, 2026
Vulnerability identifier: #VU139452
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64490
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to out-of-bounds access in virtio-snd control handling in sound/virtio/virtio_kctl.c when processing device-provided control metadata. A local user can provide a malicious or buggy virtio sound device that advertises an invalid control type or an oversized value count to cause a denial of service.
Exploitation requires the presence of a virtio sound device that supplies crafted control metadata to the guest kernel.
Affected software
Linux kernel
How to mitigate CVE-2026-64490
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3