CVE-2026-63806
kernel: KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · September 3, 2026
Description
A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component. A malicious guest operating system can trigger a host kernel crash, leading to a Denial of Service (DoS). This occurs when the guest performs a specific memory write operation that causes an unaligned memory access during an ioeventfd datamatch check, which then triggers a critical error in the host 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 · 7.1CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-617 · Reachable Assertion