CVE-2026-23053 NFS: Fix a deadlock involving nfs_release_folio()
A deadlock in the Linux kernel NFS module can cause a denial of service during memory reclamation and state recovery.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23053?
CVE-2026-23053 is a denial of service vulnerability in Linux, published on 4 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
NFS: Fix a deadlock involving nfs_release_folio()
Wang Zhaolong reports a deadlock involving NFSv4.1 state recovery waiting on kthreadd, which is attempting to reclaim memory by calling nfs_release_folio(). The latter cannot make progress due to state recovery being needed.
It seems that the only safe thing to do here is to kick off a writeback of the folio, without waiting for completion, or else kicking off an asynchronous commit.
Which versions are affected by CVE-2026-23053?
How do I fix CVE-2026-23053?
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-2026-23053 being exploited?
There is no known exploitation of CVE-2026-23053 in the wild and no public exploit code.
Sources
Also known as AZL-77157, BELL-CVE-2026-23053, DEBIAN-CVE-2026-23053, GHSA-89rw-2v88-2798, ROOT-OS-DEBIAN-13-CVE-2026-23053, ROOT-OS-UBUNTU-2404-CVE-2026-23053 and 1 more.