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CVE Record

CVE-2022-50861: NFSD: Finish converting the NFSv2 GETACL result encoder

In the Linux kernel, the following vulnerability has been resolved: NFSD: Finish converting the NFSv2 GETACL result encoder The xdr_stream conversion inadvertently left some code that set the page_len of the send buffer. The XDR stream encoders should handle this automatically now. This oversight adds garbage past the end of the Reply message. Clients typically ignore the garbage, but NFSD does not need to send it, as it leaks stale memory contents onto the wire.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A Linux NFS server bug can cause the kernel NFSD service to send extra stale memory bytes after an NFSv2 GETACL reply. Clients usually ignore the extra data, but it may expose information over the network. Business urgency depends on whether you run Linux NFS servers with NFSv2/ACL support reachable by untrusted clients.

Executive priority

Treat as a targeted remediation item for Linux NFS servers, not a broad enterprise emergency. Prioritize exposed file servers and shared infrastructure because the issue can leak memory contents, even though no exploitation evidence or severity score is provided.

Technical view

The issue is in Linux kernel NFSD’s NFSv2 GETACL result XDR encoder. During xdr_stream conversion, code still set send buffer page_len, causing garbage past the reply message and leaking stale memory contents on the wire. Public sources provide kernel stable commits but no CVSS, CWE, or exploitation confirmation.

Likely exposure

Most relevant to Linux systems acting as NFS servers, especially where NFSv2 GETACL can be requested across less-trusted networks. Systems not running NFSD, not exposing NFS, or not supporting the affected path are less likely exposed. Distro-specific exposure depends on kernel backports.

Exploitation context

No active exploitation is reported in the provided sources, and the CVE is not listed as KEV. The impact described is information disclosure: unintended stale kernel memory bytes may be transmitted in replies. Sources say clients typically ignore the extra data.

Researcher notes

Evidence is limited to the CVE record and Linux stable commit references. The vulnerable behavior is an overlong NFSD NFSv2 GETACL response caused by stale page_len handling after XDR stream conversion. Avoid assuming affected distribution packages without checking backports.

Mitigation direction

  • Identify Linux systems running NFSD/NFS server services.
  • Prioritize internet-facing or cross-trust-boundary NFS servers.
  • Update to vendor kernels containing the referenced stable fixes.
  • If updates are unavailable, check Linux distribution guidance for backports.
  • Restrict NFS access to trusted clients and networks.

Validation and detection

  • Inventory kernel versions and distribution patch status.
  • Confirm whether NFSD/NFS server functionality is enabled.
  • Check whether NFSv2 and ACL-related functionality are exposed.
  • Review vendor advisories for CVE-2022-50861 coverage.
  • Verify installed kernel includes one of the referenced stable commits or backport.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2022-50861 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux6677b0d16abe77702040768c96e2ea17cd5b3f6e, f8cba47344f794b54373189bec23195b51020faf, f8cba47344f794b54373189bec23195b51020faf, f8cba47344f794b54373189bec23195b51020faf, f8cba47344f794b54373189bec23195b51020fafunaffected
LinuxLinux5.13, 0, 5.15.86, 6.0.16, 6.1.2, 6.2affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.