CVE-2026-64527
kernel: drm/hyperv: validate VMBus packet size in receive callback
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 25, 2026
Updated · July 30, 2026
Description
A flaw was found in the drm/hyperv component of the Linux kernel. The hyperv_receive_sub() function, responsible for processing VMBus packets, does not adequately validate the size of incoming data. This oversight allows a malicious or compromised host to send specially crafted packets, potentially causing the system to read up to 16 KiB of unintended data from memory. This could lead to information disclosure or memory corruption within the kernel.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-805 · Buffer Access with Incorrect Length Value