CVE-2026-89584 block: validate user space vectors during extraction
The Linux kernel block layer fails to validate user space vector alignment, potentially causing misalignment issues that require patching to prevent errors.
- 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-2026-89584?
CVE-2026-89584 is a high-severity vulnerability in Linux, published on 11 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: validate user space vectors during extraction
The bio-based drivers don't necessarily check the alignment split, and stacking block drivers don't always handle a misalignment detected after submitting the bio. Validate user vectors against the device's dma_alignment as the bio is built from the iov_iter, rejecting misaligned early with -EINVAL.
Which versions are affected by CVE-2026-89584?
How do I fix CVE-2026-89584?
Apply the vendor's patch.
Is CVE-2026-89584 being exploited?
There is no known exploitation of CVE-2026-89584 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89584, DEBIAN-CVE-2026-89584, GHSA-rh46-v7ch-v9qg, UBUNTU-CVE-2026-89584.