CVE-2026-90396 block: fix dio leak on metadata mapping error
A local attacker can trigger a direct I/O leak in the Linux kernel block layer, potentially 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-2026-90396?
CVE-2026-90396 is a memory corruption vulnerability in Linux, published on 17 Sep 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:
block: fix dio leak on metadata mapping error
A failed integrity mapping holds a dio reference, so we need to go through the full bio ending in case there were previously submitted bio's in the sequence.
Which versions are affected by CVE-2026-90396?
How do I fix CVE-2026-90396?
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-2026-90396 being exploited?
There is no known exploitation of CVE-2026-90396 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90396, DEBIAN-CVE-2026-90396, GHSA-hxgm-rjxg-hq44, UBUNTU-CVE-2026-90396.