Linux Kernel NFSD: SECINFO_NO_NAME XDR Decode Error
CVE-2026-53398 Published on July 19, 2026
NFSD: Fix SECINFO_NO_NAME decode error cleanup
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().
Products Associated with CVE-2026-53398
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Affected Versions
Linux:- Version 5e76b25d7cc82c148d391c0c43b884e6427cb302 and below 8836405abdc53ca3dd5fc68b2cf6f8f012fad011 is affected.
- Version 07b68ff5c71cf4ed5443016d8eb116863c0a4d88 and below 49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below 5ec37edcb534f3fc92304be236d37f08e6545585 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below 1e04be34cafae119e82bcaccd6d28a20f72a3647 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below 161d1aaeb04d620d3692639700512bb5038c1e10 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below c8a24effd96d4779e2ad779654682304491c55a5 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below 46eb17d45be69d28c7a23ea03283b207426a8232 is affected.
- Version 3fdc546462348b8a497c72bc894e0cde9f10fc40 and below 9e18e83b8846a5c3fe13fc8a464b4865d33996c6 is affected.
- Version 5.10.220 and below 5.10.260 is affected.
- Version 5.15.154 and below 5.15.211 is affected.
- Version 6.1 is affected.
- Before 6.1 is unaffected.
- Version 5.10.260, <= 5.10.* is unaffected.
- Version 5.15.211, <= 5.15.* is unaffected.
- Version 6.1.177, <= 6.1.* is unaffected.
- Version 6.6.144, <= 6.6.* is unaffected.
- Version 6.12.95, <= 6.12.* is unaffected.
- Version 6.18.38, <= 6.18.* is unaffected.
- Version 7.1.3, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.