High [CVE-2026-53398] Fix SECINFO_NO_NAME decode error cleanup
This high-severity Red Hat Linux advisory covers CVE-2026-53398 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Shadow Migration Toolkit for Virtualization for RHEL 10.
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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().
A flaw was found in the Linux kernel's Network File System Daemon (NFSD). The nfsd4_decode_secinfo_no_name() function does not properly initialize a pointer (sin_exp) before processing an incoming data stream.
If the data stream is malformed or truncated, the uninitialized pointer can retain stale data from previous operations. This can lead to an improper cleanup operation, potentially causing system instability or a denial of service.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
- kernel-0:6.12.0-211.64.1.el10_2
- kernel-0:5.14.0-687.56.1.el9_8
- RHSA-2026:77690
- RHSA-2026:77689
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
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