CVE-2026-90148 NFSv4: Fix incorrect argument passed to nfs4_delete_lease() in nfs4_add_lease()
A race condition in the Linux kernel NFSv4 implementation causes a NULL pointer dereference, leading to a denial of service.
- 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-2026-90148?
CVE-2026-90148 is a 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:
NFSv4: Fix incorrect argument passed to nfs4_delete_lease() in nfs4_add_lease()
When nfs4_add_lease() races with a delegation return, it calls nfs4_delete_lease() to clean up. Previously, it passed priv, which can legitimately be NULL. Passing a NULL priv eventually leads to a NULL pointer dereference in generic_setlease().
Which versions are affected by CVE-2026-90148?
How do I fix CVE-2026-90148?
Apply the vendor's patch.
Is CVE-2026-90148 being exploited?
There is no known exploitation of CVE-2026-90148 in the wild and no public exploit code.
Sources
Also known as AZL-102264, BELL-CVE-2026-90148, DEBIAN-CVE-2026-90148, GHSA-h59h-gp4w-wvx7, UBUNTU-CVE-2026-90148.