CVE-2026-90102

Status: UPDATED  |  Advisory ID: CVE-2026-90102

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

NFSv4/pnfs: key the data server cache on the NFS version

nfs4_pnfs_ds_add() keys the per-net data server cache on the multipath

address set alone, and struct nfs4_pnfs_ds records no version. That

suffices for the files layout driver, which always connects with version

4, but flexfiles takes its version tuple from GETDEVICEINFO per device,

and one address can legitimately serve both NFSv3 and NFSv4.

Two deviceids on one address with different ds_versions[0].version

therefore share a single nfs4_pnfs_ds, and whichever mirror connects

first pins ds_clp to its own version. The other one is handed that

client anyway, so it selects rpc_call_ops for a version the connection

does not speak, and the mismatched sequence-slot handling dereferences

NULL.

Add the version to the cache key so the two cannot alias, giving each

version its own nfs4_pnfs_ds and connection while both mirrors stay

usable. Only the major version is compared, since that is what selects

rpc_call_ops and rpc_ops; v4.0 and v4.1 keep sharing a client. The files

layout driver passes the 4 it already hardcodes at connect time. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References