CVE-2025-38089Public exploitNetwork attack vector

Remote kernel crash via SUNRPC authentication error

Published Jun 30, 2025 · Updated Aug 5, 2026

NULL pointer dereference in affected Linux kernels allows remote attackers to crash NFS servers via a malformed RPC request. The SUNRPC authentication path treats SVC_GARBAGE as GARBAGE_ARGS and writes through rq_accept_statp even when decoding left it NULL or stale. An unauthenticated host that can reach the kernel RPC listener can kill nfsd threads and interrupt NFS service; reused threads can instead incur kernel memory corruption.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernels allows remote attackers to crash NFS servers via a malformed RPC request. The SUNRPC authentication path treats SVC_GARBAGE as GARBAGE_ARGS and writes through rq_accept_statp even when decoding left it NULL or stale. An unauthenticated host that can reach the kernel RPC listener can kill nfsd threads and interrupt NFS service; reused threads can instead incur kernel memory corruption.

The record

CVE
CVE-2025-38089
Published
Jun 30, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <353e75b55e583635bf71cde6abcec274dba05edd
  2. Affected versionversion=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <599c489eea793821232a2f69a00fa57d82b0ac98
  3. Affected versionversion=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <94d10a4dba0bc482f2b01e39f06d5513d0f75742
  4. Affected versionversion=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <c90459cd58bb421d275337093d8e901e0ba748dd
  5. Affected versionversion=6.3.4 <6.4
  6. Affected versionversion=6.4
  7. Affected versionversion=9b59f5c4911e87264507e0934cd2bb277390c560

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <353e75b55e583635bf71cde6abcec274dba05edd; version=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <599c489eea793821232a2f69a00fa57d82b0ac98; version=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <94d10a4dba0bc482f2b01e39f06d5513d0f75742; version=29cd2927fb914cc53b5ba4f67d2b74695c994ba4 <c90459cd58bb421d275337093d8e901e0ba748dd; version=6.3.4 <6.4; version=6.4; version=9b59f5c4911e87264507e0934cd2bb277390c560

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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