CVE-2023-54269Network attack vector

Kernel crash via deferred SUNRPC double free

Published Dec 30, 2025 · Updated Dec 30, 2025

A double free in Linux kernel SUNRPC allows remote attackers to crash an NFS server through unauthenticated RPC requests. During a second deferral, svc_defer() reuses svc_deferred_req without clearing rq_xprt_ctxt, so release and revisit paths free or reuse the same UDP or RDMA transport context twice. Any unauthenticated host that can reach UDP port 2049 or NFS/RDMA can trigger kernel-memory corruption and a repeatable kernel panic, interrupting the server.

CVSS severity9.8
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double free in Linux kernel SUNRPC allows remote attackers to crash an NFS server through unauthenticated RPC requests. During a second deferral, svc_defer() reuses svc_deferred_req without clearing rq_xprt_ctxt, so release and revisit paths free or reuse the same UDP or RDMA transport context twice. Any unauthenticated host that can reach UDP port 2049 or NFS/RDMA can trigger kernel-memory corruption and a repeatable kernel panic, interrupting the server.

The record

CVE
CVE-2023-54269
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=11fab500f86403b2ebf6795feeade6e10302e448
  2. Affected versionversion=5.18
  3. Affected versionversion=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <e0c648627322a4c7e018e5c7f837c3c03e297dbb
  4. Affected versionversion=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1
  5. Affected versionversion=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <fd86534872f445f54dc01e7db001e25eadf063a8
  6. Affected versionversion=f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d <7851771789e87108a92697194105ef0c9307dc5e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=11fab500f86403b2ebf6795feeade6e10302e448; version=5.18; version=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <e0c648627322a4c7e018e5c7f837c3c03e297dbb; version=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1; version=773f91b2cf3f52df0d7508fdbf60f37567cdaee4 <fd86534872f445f54dc01e7db001e25eadf063a8; version=f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d <7851771789e87108a92697194105ef0c9307dc5e

Published CVSS scores

9.8Linux kernel CVE teamCVSS: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.

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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

T1499.004Application or System Exploitation

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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