CVE-2026-53398

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5e76b25d7cc82c148d391c0c43b884e6427cb302 < 8836405abdc53ca3dd5fc68b2cf6f8f012fad011affected
LinuxLinux07b68ff5c71cf4ed5443016d8eb116863c0a4d88 < 49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < 5ec37edcb534f3fc92304be236d37f08e6545585affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < 1e04be34cafae119e82bcaccd6d28a20f72a3647affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < 161d1aaeb04d620d3692639700512bb5038c1e10affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < c8a24effd96d4779e2ad779654682304491c55a5affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < 46eb17d45be69d28c7a23ea03283b207426a8232affected
LinuxLinux3fdc546462348b8a497c72bc894e0cde9f10fc40 < 9e18e83b8846a5c3fe13fc8a464b4865d33996c6affected
LinuxLinux5.10.220 < 5.10.260affected
LinuxLinux5.15.154 < 5.15.211affected
LinuxLinux6.1affected
LinuxLinux0 < 6.1unaffected
LinuxLinux5.10.260 <= 5.10.*unaffected
LinuxLinux5.15.211 <= 5.15.*unaffected
LinuxLinux6.1.177 <= 6.1.*unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References