CVE-2026-86846 Dpdk: dpdk: guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto
A guest can trigger an out-of-bounds write in the host vhost-crypto backend by controlling the avail ring index, potentially leading to code execution or privilege escalation.
- 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-2026-86846?
CVE-2026-86846 is a medium-severity memory corruption vulnerability in Red Hat Fast Datapath for RHEL 10, published on 14 Oct 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 DPDK lib/vhost vhost-crypto. A guest can supply an avail-ring descriptor index that is used without bounds checking, causing an out-of-bounds write in the host vhost-crypto backend.
Weakness: CWE-787
Which versions are affected by CVE-2026-86846?
How do I fix CVE-2026-86846?
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-2026-86846 being exploited?
There is no known exploitation of CVE-2026-86846 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-86846, GHSA-7w2x-cjwh-h7x7, UBUNTU-CVE-2026-86846.