CVE-2026-46256
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability related to LOCALIO in NFS has been resolved in the Linux kernel, which could lead to recursive deadlock during direct memory reclaim. This issue occurred when LOCALIO transitioned to XFS and then back to NFS via nfs_writepages.
Risk Assessment
Organizations may face performance and stability issues due to potential deadlocks, which can lead to service interruptions.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability and prevent deadlock issues.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages. Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context. Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").