CVE-2022-50241Network attack vector

Remote kernel memory corruption via stale copy state

Published Sep 15, 2025 · Updated Sep 15, 2025

Use-after-free in Linux kernel NFSD allows remote authenticated users to corrupt kernel memory through NFSv4.2 inter-server COPY. nfsd4_close_open_stateid frees lock states without removing their copy state from sc_cp_list, so the laundromat later dereferences an expired cpntf_state. An NFSv4.2 client with valid export open and lock state can control the CLOSE-before-FREE_STATEID sequence, risking a server crash or kernel memory compromise.

CVSS severity7.8
High
EPSS probability0.36%
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 NFSD allows remote authenticated users to corrupt kernel memory through NFSv4.2 inter-server COPY. nfsd4_close_open_stateid frees lock states without removing their copy state from sc_cp_list, so the laundromat later dereferences an expired cpntf_state. An NFSv4.2 client with valid export open and lock state can control the CLOSE-before-FREE_STATEID sequence, risking a server crash or kernel memory compromise.

The record

CVE
CVE-2022-50241
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <019805fea91599b22dfa62ffb29c022f35abeb06
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35aa0fb8c3033a3d78603356e96fc18c5b9cceb2
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ea71246b7a02af675d733e72d14bd0d591d5f4a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <83b94969751a691347606dbe6b1865efcfa5a643
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bbacfcde5fff25ac22597e8373a065c647da6738

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <019805fea91599b22dfa62ffb29c022f35abeb06; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35aa0fb8c3033a3d78603356e96fc18c5b9cceb2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ea71246b7a02af675d733e72d14bd0d591d5f4a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <83b94969751a691347606dbe6b1865efcfa5a643; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bbacfcde5fff25ac22597e8373a065c647da6738

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
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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