CVE-2026-93257 block: handle nogenerate/noverify properly in fs-integrity
A flaw in the Linux kernel's block layer integrity handling can cause crashes when processing non-PI metadata, leading to 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-2026-93257?
CVE-2026-93257 is a denial of service vulnerability in Linux, published on 24 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: handle nogenerate/noverify properly in fs-integrity
Check the BIP_CHECK flags before generating or verifying PI information, otherwise this can be incorrectly called for non-PI metadata and cause generation of incorrect metadata and crashed in the verification handler.
The new behavior matches that of the block layer auto-generated metadata.
Which versions are affected by CVE-2026-93257?
How do I fix CVE-2026-93257?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93257 being exploited?
There is no known exploitation of CVE-2026-93257 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93257, GHSA-4jwc-f9v9-q77h, UBUNTU-CVE-2026-93257.