Out-of-bounds read in Oracle VM VirtualBox - CVE-2026-21963
Published: January 20, 2026 / Updated: February 19, 2026
Vulnerability identifier: #VU121770
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21963
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Oracle
Affected software:
Oracle VM VirtualBox
Oracle VM VirtualBox
Detailed vulnerability description
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to a boundary condition within the BusLogic module. A local user can trigger an out-of-bounds read error and read contents of memory on the system.
How to mitigate CVE-2026-21963
Install updates from vendor's website.