CVE-2022-50861Network attack vector

Kernel memory disclosure via oversized GETACL replies

Published Dec 30, 2025 · Updated Dec 30, 2025

Information disclosure in the Linux NFS server allows remote attackers to read stale kernel memory through NFSv2 GETACL replies. The encoder in fs/nfsd/nfs2acl.c manually sets rq_res.page_len after XDR stream conversion, appending stale reply-page contents past the valid message. A valid filehandle and network access to the NFSACL service are required, but no privileged credentials or user interaction are needed.

CVSS severity7.0
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux NFS server allows remote attackers to read stale kernel memory through NFSv2 GETACL replies. The encoder in fs/nfsd/nfs2acl.c manually sets rq_res.page_len after XDR stream conversion, appending stale reply-page contents past the valid message. A valid filehandle and network access to the NFSACL service are required, but no privileged credentials or user interaction are needed.

The record

CVE
CVE-2022-50861
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=5.13
  2. Affected versionversion=6677b0d16abe77702040768c96e2ea17cd5b3f6e <a20b0abab966a189a79aba6ebf41f59024a3224d
  3. Affected versionversion=f8cba47344f794b54373189bec23195b51020faf <2b825efb0577a32a872e872a869e0947cf9dd6d3
  4. Affected versionversion=f8cba47344f794b54373189bec23195b51020faf <5030d4d2bf8b6f6f3d16401ab92a88bc5aa2377a
  5. Affected versionversion=f8cba47344f794b54373189bec23195b51020faf <d5b867fd2d7f79630b1a2906a7bb4f4b75bf297a
  6. Affected versionversion=f8cba47344f794b54373189bec23195b51020faf <ea5021e911d3479346a75ac9b7d9dcd751b0fb99

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=6677b0d16abe77702040768c96e2ea17cd5b3f6e <a20b0abab966a189a79aba6ebf41f59024a3224d; version=f8cba47344f794b54373189bec23195b51020faf <2b825efb0577a32a872e872a869e0947cf9dd6d3; version=f8cba47344f794b54373189bec23195b51020faf <5030d4d2bf8b6f6f3d16401ab92a88bc5aa2377a; version=f8cba47344f794b54373189bec23195b51020faf <d5b867fd2d7f79630b1a2906a7bb4f4b75bf297a; version=f8cba47344f794b54373189bec23195b51020faf <ea5021e911d3479346a75ac9b7d9dcd751b0fb99

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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