CVE-2026-98727 nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
A Linux kernel bug in NVMe multipath causes a crash when writing to a zoned namespace with zero zone size, requiring a patch.
- 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-2026-98727?
CVE-2026-98727 is a denial of service vulnerability in Linux, published on 18 Oct 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:
nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
The namespace head is marked zoned at allocation time based only on the command set identifier. If the zone info query reports a zero zone size, the path namespace is registered without zoned limits while the head still advertises the zoned capability with a zone size of zero, and reporting zones or writing to the head then shifts by ilog2(0).
Drop the zoned feature from the head allocation and let the head limits refresh stack it in from the path namespace instead.
Which versions are affected by CVE-2026-98727?
How do I fix CVE-2026-98727?
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-2026-98727 being exploited?
There is no known exploitation of CVE-2026-98727 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98727, DEBIAN-CVE-2026-98727, GHSA-7665-pcff-x7hw, UBUNTU-CVE-2026-98727.