CVE-2026-53398 Details
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().
A vulnerability in the Linux kernel's NFS server implementation (NFSD) has been addressed. The issue arose in the SECINFO_NO_NAME decoding process, where the decoder initialized a variable after decoding another, leading to potential errors. If the XDR stream was truncated, the decoder would return an error before properly initializing the variable, causing it to hold outdated information from previous operations. This problem was exacerbated by a change that reduced the clearing of certain data structures between RPC calls, allowing stale data to interfere with the decoding process. The vulnerability could result in improper handling of NFS requests, potentially leading to data corruption or other unintended consequences.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for upgrading the kernel can be found in the official Linux documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/161d1aaeb04d620d3692639700512bb5038c1e10 | kernel.org | Patch |
| https://git.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647 | kernel.org | Patch |
| https://git.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232 | kernel.org | Patch |
| https://git.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439 | kernel.org | Patch |
| https://git.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8836405abdc53ca3dd5fc68b2cf6f8f012fad011 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9e18e83b8846a5c3fe13fc8a464b4865d33996c6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c8a24effd96d4779e2ad779654682304491c55a5 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.10.220, < 5.10.260 >= 5.15.154, < 5.15.211 >= 6.1, < 6.1.177 >= 6.2, < 6.6.144 >= 6.7, < 6.12.95 >= 6.13, < 6.18.38 >= 6.19, < 7.1.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 29, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |