CVE-2026-74730Network attack vector

Use-after-free via unpinned NFS server reference

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in Linux kernel NFS client code allows attackers to access a freed nfs_server during delayed FREE_STATEID work. The FREE_STATEID path in fs/nfs/nfs4proc.c leaves struct nfs_server unpinned while the asynchronous operation remains in flight. A delayed operation can therefore outlive server cleanup; public sources confirm the freed-object access but identify no resulting crash, disclosure, or code execution.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel NFS client code allows attackers to access a freed nfs_server during delayed FREE_STATEID work. The FREE_STATEID path in fs/nfs/nfs4proc.c leaves struct nfs_server unpinned while the asynchronous operation remains in flight. A delayed operation can therefore outlive server cleanup; public sources confirm the freed-object access but identify no resulting crash, disclosure, or code execution.

The record

CVE
CVE-2026-74730
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record 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=3.10
  2. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <80ed3d762628b36c9e4b22fac7c65b72ef3b13dd
  3. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <af62f1af182d33a0de38308c012841885d8ab92e
  4. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <caee6a68ffaa5016dfc01cd0b3dc1896a32e3abd
  5. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <cf616096a0f3a2b60f7d68b6b39674a6867ded9c
  6. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <d71dfffa512e71b166a889484e4c3b148a9a3af2
  7. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <d858ab09e787106432d4d9830bad9dfedf02f890
  8. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <ed1161ab6239761958b38d5667225634fc2be894
  9. Affected versionversion=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <ed2f92ce2fc48463c41e0e540b9a3454889e8af8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <80ed3d762628b36c9e4b22fac7c65b72ef3b13dd; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <af62f1af182d33a0de38308c012841885d8ab92e; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <caee6a68ffaa5016dfc01cd0b3dc1896a32e3abd; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <cf616096a0f3a2b60f7d68b6b39674a6867ded9c; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <d71dfffa512e71b166a889484e4c3b148a9a3af2; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <d858ab09e787106432d4d9830bad9dfedf02f890; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <ed1161ab6239761958b38d5667225634fc2be894; version=7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009 <ed2f92ce2fc48463c41e0e540b9a3454889e8af8

Published CVSS scores

9.8Canonical UbuntuCVSS: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

No sourced classifications are available.

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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