CVE-2026-53398

Description

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore leave sin_exp holding stale union contents from a previous operation. The error response path still invokes nfsd4_secinfo_no_name_release(), which calls exp_put() on a non-NULL sin_exp. Initialize sin_exp before the first failable decode step, matching nfsd4_decode_secinfo().

References

• https://git.kernel.org/stable/c/161d1aaeb04d620d3692639700512bb5038c1e10
• https://git.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647
• https://git.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232
• https://git.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439
• https://git.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585