CVE-2026-46256

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").