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CVE-2026-53398

CRITICALCVSS 9.8/10EPSS 0.51%

Last modified

CVE-2026-53398 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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().

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.51%

40.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 5e76b25d7cc82c148d391c0c43b884e6427cb302, < 8836405abdc53ca3dd5fc68b2cf6f8f012fad011; >= 07b68ff5c71cf4ed5443016d8eb116863c0a4d88, < 49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < 5ec37edcb534f3fc92304be236d37f08e6545585; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < 1e04be34cafae119e82bcaccd6d28a20f72a3647; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < 161d1aaeb04d620d3692639700512bb5038c1e10; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < c8a24effd96d4779e2ad779654682304491c55a5; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < 46eb17d45be69d28c7a23ea03283b207426a8232; >= 3fdc546462348b8a497c72bc894e0cde9f10fc40, < 9e18e83b8846a5c3fe13fc8a464b4865d33996c6; >= 5.10.220, < 5.10.260; >= 5.15.154, < 5.15.211
LinuxLinux6.1

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-53398?
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().
How severe is CVE-2026-53398?
CVE-2026-53398 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2026-53398?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST