CVE-2023-53680Network attack vector

NFS service crash via unchecked operation index

Published Oct 7, 2025 · Updated Oct 7, 2025

Out-of-bounds access in Linux NFSD allows remote attackers to crash the NFS service with a malformed NFSv4 COMPOUND request. nfsd4_decode_compound() can pass OP_ILLEGAL value 10044 to OPDESC(), which indexes nfsd4_ops[] without validating the operation number. Any host that can reach TCP port 2049 can enter the decoder before export or NFSv4 authorization checks, faulting an NFSD kernel thread and taking the service down.

CVSS severity7.5
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux NFSD allows remote attackers to crash the NFS service with a malformed NFSv4 COMPOUND request. nfsd4_decode_compound() can pass OP_ILLEGAL value 10044 to OPDESC(), which indexes nfsd4_ops[] without validating the operation number. Any host that can reach TCP port 2049 can enter the decoder before export or NFSv4 authorization checks, faulting an NFSD kernel thread and taking the service down.

The record

CVE
CVE-2023-53680
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.14
  2. Affected versionversion=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <50827896c365e0f6c8b55ed56d444dafd87c92c5
  3. Affected versionversion=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <804d8e0a6e54427268790472781e03bc243f4ee3
  4. Affected versionversion=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <a64160124d5a078be0c380b1e8a0bad2d040d3a1
  5. Affected versionversion=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <f352c41fa718482979e7e6b71b4da2b718e381cc
  6. Affected versionversion=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <50827896c365e0f6c8b55ed56d444dafd87c92c5; version=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <804d8e0a6e54427268790472781e03bc243f4ee3; version=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <a64160124d5a078be0c380b1e8a0bad2d040d3a1; version=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <f352c41fa718482979e7e6b71b4da2b718e381cc; version=f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 <ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e

Published CVSS scores

7.5Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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