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CVE Record

CVE-2022-50348: nfsd: Fix a memory leak in an error handling path

In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix a memory leak in an error handling path If this memdup_user() call fails, the memory allocated in a previous call a few lines above should be freed. Otherwise it leaks.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50348 is a Linux kernel NFS server memory leak in an error path. A local low-privileged user could potentially consume kernel memory and affect availability. The public record rates it medium, with no confidentiality or integrity impact stated.

Executive priority

Treat as routine but real availability risk. Patch through the normal kernel maintenance process, prioritizing shared infrastructure and NFS-capable servers. Escalation is not supported by the provided evidence because exploitation is not reported and access is local.

Technical view

The issue is CWE-401 in nfsd error handling: if a memdup_user() call fails, memory allocated earlier is not freed. CVSS 3.1 is 5.5 with local access, low complexity, low privileges, no user interaction, and high availability impact.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel builds, especially where the NFS server component is present. The bundle lists Linux as affected and includes stable kernel fix references; exact exposure should be validated against distribution backports.

Exploitation context

The provided sources do not show active exploitation, and KEV status is false. The CVSS vector requires local access and low privileges, so this is not described as a remote unauthenticated issue.

Researcher notes

The record describes a narrow nfsd memory-management defect fixed by freeing earlier allocation on memdup_user() failure. Evidence is sufficient for triage, but incomplete for distribution-specific affected ranges, exploitability in default configurations, or non-upstream backport status.

Mitigation direction

  • Apply kernel updates that include the referenced stable fixes.
  • Prioritize Linux systems using affected kernel lines and NFS server functionality.
  • Check your Linux distribution advisory for exact fixed package versions.
  • If patching is delayed, follow vendor guidance for supported temporary risk reduction.

Validation and detection

  • Inventory running kernel versions across Linux hosts.
  • Identify hosts with NFS server functionality enabled or packaged.
  • Compare installed kernels with distribution advisories for CVE-2022-50348.
  • Confirm updated kernels include one of the referenced stable fixes.
  • Track reboot status after kernel package deployment.
Prepared
Confidence
high
Sources
8

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.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-401: Exact CWE lookup

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cve · low confidence lookup

CVE-2022-50348 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
1ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2022-50348Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux6ee95d1c899186c0798cafd25998d436bcdb9618, 6ee95d1c899186c0798cafd25998d436bcdb9618, 6ee95d1c899186c0798cafd25998d436bcdb9618, 6ee95d1c899186c0798cafd25998d436bcdb9618, 6ee95d1c899186c0798cafd25998d436bcdb9618, 6ee95d1c899186c0798cafd25998d436bcdb9618unaffected
LinuxLinux5.4, 0, 5.4.220, 5.10.150, 5.15.75, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

CWE-401

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