CVE-2026-89098 Nfs-utils: nfs-utils: denial of service via assertion failure in fsidd
A local user can crash the fsidd daemon by sending malformed requests, causing a denial of service for filesystem identifier lookups.
- 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-2026-89098?
CVE-2026-89098 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 16 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 nfs-utils. The fsidd daemon improperly handles input received over its local domain socket by relying on program assertions to verify command arguments. A local user can exploit this vulnerability by sending a malformed request lacking the required arguments to trigger an assertion failure. This causes the daemon to crash, resulting in a Denial of Service (DoS) for filesystem identifier lookup services until restarted.
Weakness: CWE-617
Which versions are affected by CVE-2026-89098?
How do I fix CVE-2026-89098?
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-2026-89098 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89098 exists.
Sources
Also known as AZL-109794, BELL-CVE-2026-89098, DEBIAN-CVE-2026-89098, ECHO-813c-68f6-1e57, GHSA-7q29-687q-4m44, UBUNTU-CVE-2026-89098.