CVE-2024-50121

Kernel memory corruption via asynchronous NFSD shutdown

Published Nov 5, 2024 · Updated May 23, 2026

Use-after-free in the NFSD component of Linux allows local users to compromise or interrupt the kernel during NFS server shutdown. nfs4_state_shutdown_net calls cancel_work without waiting, so concurrent expire_client processing can retain an unhashed nfs4_client while NFSD destroys its file caches. Reachability requires local privilege to write 0 to /proc/fs/nfsd/threads while nfsd_client_shrinker is running; the race leaves stale file objects and can corrupt kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the NFSD component of Linux allows local users to compromise or interrupt the kernel during NFS server shutdown. nfs4_state_shutdown_net calls cancel_work without waiting, so concurrent expire_client processing can retain an unhashed nfs4_client while NFSD destroys its file caches. Reachability requires local privilege to write 0 to /proc/fs/nfsd/threads while nfsd_client_shrinker is running; the race leaves stale file objects and can corrupt kernel memory or crash the system.

The record

CVE
CVE-2024-50121
Published
Nov 5, 2024
Updated
May 23, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 5, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=2bbf10861d51dae76c6da7113516d0071c782653 <f67138dd338cb564ade7d3755c8cd4f68b46d397; version=5.10.220 <5.10.233; version=5.15.154 <5.15.176; version=6.1.81 <6.1.123; version=6.2; version=7c24fa225081f31bc6da6a355c1ba801889ab29a <add1df5eba163a3a6ece11cb85890e2e410baaea; version=7c24fa225081f31bc6da6a355c1ba801889ab29a <d5ff2fb2e7167e9483846e34148e60c0c016a1f6; version=7c24fa225081f31bc6da6a355c1ba801889ab29a <f965dc0f099a54fca100acf6909abe52d0c85328; version=958294a3eb82026fcfff20b0287a90e9c854785e <5ade4382de16c34d9259cb548f36ec5c4555913c; version=f3ea5ec83d1a827f074b2b660749817e0bf2b23e <36775f42e039b01d4abe8998bf66771a37d3cdcc

Published CVSS scores

5.7OracleCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 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

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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