CVE-2022-50235Network attack vector

Remote kernel memory corruption via oversized READDIR count

Published Sep 15, 2025 · Updated Sep 15, 2025

Out-of-bounds write in Linux kernel NFSD allows remote attackers to corrupt kernel memory via a crafted NFSv2 READDIR request. nfsd_init_dirlist_pages accepts the request count up to the transport payload while reserving one response page, causing XDR encoding to write into adjacent rq_pages. Network access to an NFSv2 export is sufficient; the corruption enables kernel-memory disclosure, kernel-state modification, code execution, or a host crash.

CVSS severity9.8
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel NFSD allows remote attackers to corrupt kernel memory via a crafted NFSv2 READDIR request. nfsd_init_dirlist_pages accepts the request count up to the transport payload while reserving one response page, causing XDR encoding to write into adjacent rq_pages. Network access to an NFSv2 export is sufficient; the corruption enables kernel-memory disclosure, kernel-state modification, code execution, or a host crash.

The record

CVE
CVE-2022-50235
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.16
  2. Affected versionversion=53b1119a6e5028b125f431a0116ba73510d82a72 <00b4492686e0497fdb924a9d4c8f6f99377e176c
  3. Affected versionversion=53b1119a6e5028b125f431a0116ba73510d82a72 <c2a878095b5c6f04f90553a3c45872f990dab14e
  4. Affected versionversion=53b1119a6e5028b125f431a0116ba73510d82a72 <f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d
  5. Affected versionversion=9e291a6a28d32545ed2fd959a8165144d1724df1 <0e57d696f60dee6117a8ace0cac7c5761d375277
  6. Affected versionversion=eabc0aab98e5218ceecd82069b0d6fdfff5ee885 <dc7f225090c29a5f3b9419b1af32846a201555e7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=53b1119a6e5028b125f431a0116ba73510d82a72 <00b4492686e0497fdb924a9d4c8f6f99377e176c; version=53b1119a6e5028b125f431a0116ba73510d82a72 <c2a878095b5c6f04f90553a3c45872f990dab14e; version=53b1119a6e5028b125f431a0116ba73510d82a72 <f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d; version=9e291a6a28d32545ed2fd959a8165144d1724df1 <0e57d696f60dee6117a8ace0cac7c5761d375277; version=eabc0aab98e5218ceecd82069b0d6fdfff5ee885 <dc7f225090c29a5f3b9419b1af32846a201555e7

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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