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Linux Kernel CVE-2025-38430

MEDIUM
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Debian Debian Linux
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
May 12, 2026 - 13:32 vuln.today
CVE Published
Jul 25, 2025 - 15:15 nvd
MEDIUM 5.5

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request

If the request being processed is not a v4 compound request, then examining the cstate can have undefined results.

This patch adds a check that the rpc procedure being executed (rq_procinfo) is the NFSPROC4_COMPOUND procedure.

AnalysisAI

Denial of service in Linux kernel nfsd (NFS server daemon) allows local authenticated attackers to crash the system by triggering undefined behavior in nfsd4_spo_must_allow() when non-v4 compound RPC requests are processed. The vulnerability stems from missing validation that incoming RPC procedures are NFSv4 COMPOUND requests before examining internal state structures, causing memory access violations and system unavailability.

Technical ContextAI

The Linux kernel's nfsd module implements the Network File System Protocol server. The nfsd4_spo_must_allow() function is part of NFSv4 compound request processing and examines the compound state (cstate) structure to determine security policy enforcement. The vulnerability occurs because this function did not validate that the incoming RPC procedure matched NFSPROC4_COMPOUND before dereferencing cstate, which is only initialized and valid for v4 compound requests. When a non-v4 RPC procedure calls this function, cstate contains uninitialized or invalid data, leading to memory safety violations. The fix adds an explicit check comparing rq_procinfo (the RPC procedure being executed) against NFSPROC4_COMPOUND, ensuring cstate examination only occurs on valid v4 compound requests.

RemediationAI

Upgrade Linux kernel to a patched version containing the nfsd4_spo_must_allow() validation check. Patch commits are available in stable kernel branches (see references); most distributions will receive fixes in their next kernel security update. For Debian, apply updates from debian-lts-announce advisories dated October 2025. Affected administrators should prioritize patching systems with nfsd enabled and local user access, particularly shared hosting or multi-tenant deployments. As a temporary workaround pending patching, disable NFSv4 server functionality (unmount nfsd, disable nfs-server service, or restrict NFS to v3-only) if operationally acceptable, though this eliminates NFS service availability. Alternatively, restrict local shell access and enforce strict user account management to limit attack surface to authenticated users only, though this is not a substitute for patching.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Affected
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected
Image SLES-SAP-Azure Image SLES-SAP-Azure-3P Image SLES-SAP-BYOS-Azure Image SLES-SAP-BYOS-EC2 Image SLES-SAP-BYOS-GCE Image SLES-SAP-EC2 Image SLES-SAP-GCE Image SLES-SAP-GCE-3P Affected

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CVE-2025-38430 vulnerability details – vuln.today
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