CVE-2026-72472

Kernel crash via NFS file-lock list race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux kernel NFS client allows local users to crash affected systems during NFS file-lock recovery. Lock-list traversal releases flc_lock while slow recovery or delegation-recall work proceeds, while so_delegreturn_mutex cannot serialize multiple nfs4_state objects for one inode. Reaching the flaw requires low-privileged local access and an NFS recovery or delegation-recall path; the bounded consequence is system interruption.

CVSS severity7.3
High
EPSS probability0.64%
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 the Linux kernel NFS client allows local users to crash affected systems during NFS file-lock recovery. Lock-list traversal releases flc_lock while slow recovery or delegation-recall work proceeds, while so_delegreturn_mutex cannot serialize multiple nfs4_state objects for one inode. Reaching the flaw requires low-privileged local access and an NFS recovery or delegation-recall path; the bounded consequence is system interruption.

The record

CVE
CVE-2026-72472
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.0
  2. Affected versionversion=c69899a17ca4836230720e65493942d9582a0424 <1cda95bf2e9c0e6b63545b7565fe4a1e474322f4
  3. Affected versionversion=c69899a17ca4836230720e65493942d9582a0424 <4837fb36219e6c08b666bc31a86841bad8526358
  4. Affected versionversion=c69899a17ca4836230720e65493942d9582a0424 <e68035178e65e2b3aa386ce61202ff33724ae418
  5. Affected versionversion=c69899a17ca4836230720e65493942d9582a0424 <f161ef7b0dd2f51fdb002ba4a4e9bf0ee7409218

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=c69899a17ca4836230720e65493942d9582a0424 <1cda95bf2e9c0e6b63545b7565fe4a1e474322f4; version=c69899a17ca4836230720e65493942d9582a0424 <4837fb36219e6c08b666bc31a86841bad8526358; version=c69899a17ca4836230720e65493942d9582a0424 <e68035178e65e2b3aa386ce61202ff33724ae418; version=c69899a17ca4836230720e65493942d9582a0424 <f161ef7b0dd2f51fdb002ba4a4e9bf0ee7409218

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3UbuntuCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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