CVE-2026-2243 Qemu-kvm: heap buffer out-of-bounds read in vmdk compressed grain parsing
A crafted VMDK image in QEMU can cause an out-of-bounds read, leaking sensitive data or causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-2243?
CVE-2026-2243 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 19 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in QEMU. A specially crafted VMDK image could trigger an out-of-bounds read vulnerability, potentially leading to a 12-byte leak of sensitive information or a denial of service condition (DoS).
Weakness: CWE-125
Which versions are affected by CVE-2026-2243?
How do I fix CVE-2026-2243?
Apply the vendor's patch.
Is CVE-2026-2243 being exploited?
There is no known exploitation of CVE-2026-2243 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-2243, DEBIAN-CVE-2026-2243, ECHO-0bba-06ee-767f, GHSA-cw9w-w7fx-35q6, OESA-2026-2090, OESA-2026-2091 and 3 more.