CVE-2026-43248 vhost: move vdpa group bound check to vhost_vdpa
An out-of-bounds write in the Linux kernel vhost vdpa driver allows attackers to potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43248?
CVE-2026-43248 is a high-severity memory corruption vulnerability in Linux kernel, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
vhost: move vdpa group bound check to vhost_vdpa
Remove duplication by consolidating these here. This reduces the posibility of a parent driver missing them.
While we're at it, fix a bug in vdpa_sim where a valid ASID can be assigned to a group equal to ngroups, causing an out of bound write.
Weakness: CWE-787
Which versions are affected by CVE-2026-43248?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43248?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-43248 being exploited?
There is no known exploitation of CVE-2026-43248 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-85782, BELL-CVE-2026-43248, DEBIAN-CVE-2026-43248, GHSA-xpcf-mwvf-62v9, ROOT-OS-DEBIAN-12-CVE-2026-43248, ROOT-OS-UBUNTU-2404-CVE-2026-43248 and 1 more.