CVE-2026-90102

/// Technical description

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 com

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References