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CVE Record

CVE-2022-50385: NFS: Fix an Oops in nfs_d_automount()

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix an Oops in nfs_d_automount() When mounting from a NFSv4 referral, path->dentry can end up being a negative dentry, so derive the struct nfs_server from the dentry itself instead.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel NFS client crash issue. A local, low-privileged user on an affected system can trigger a kernel Oops during NFSv4 referral automount handling, impacting availability. The sources indicate no confidentiality or integrity impact and do not show active exploitation.

Executive priority

Treat as a moderate availability risk. It is unlikely to drive emergency response without local user exposure or NFSv4 referral use, but it should be included in routine kernel patch cycles for affected systems.

Technical view

nfs_d_automount() incorrectly handled an NFSv4 referral case where path->dentry can be a negative dentry. The fix derives struct nfs_server from the dentry itself. CVSS 3.1 is 5.5: local vector, low complexity, low privileges, no user interaction, and high availability impact.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel builds where NFSv4 referral automount behavior is reachable. The supplied affected-version data is limited, so confirm against distribution kernel advisories and the referenced stable commits.

Exploitation context

The CVE is not marked as CISA KEV, and the supplied sources do not cite active exploitation. The CVSS vector indicates local access is required, so remote-only exposure is not supported by the evidence provided.

Researcher notes

Evidence supports a kernel availability flaw in NFSv4 referral automount handling. The source bundle does not provide exploit details, affected distribution packages, or compensating controls, so validation should stay tied to kernel versions, NFS configuration, and vendor advisories.

Mitigation direction

  • Update affected Linux kernels using vendor or distribution guidance.
  • Prioritize systems using NFSv4 referrals or automount workflows.
  • Track the referenced upstream stable commits in kernel update planning.
  • If patching is delayed, review NFS referral exposure and access controls.

Validation and detection

  • Inventory Linux kernel versions across NFS client systems.
  • Check whether NFSv4 referrals or automount paths are in operational use.
  • Compare installed kernels with vendor advisories and referenced stable commits.
  • Monitor kernel logs for Oops events related to NFS automount handling.
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.

ATT&CK lookup starting points

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CVE-2022-50385 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
0Timeline events
0ADP providers
6Source links

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:H1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2022-50385Attack 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2b0143b5c986be1ce8408b3aadc4709e0a94429d, 2b0143b5c986be1ce8408b3aadc4709e0a94429d, 2b0143b5c986be1ce8408b3aadc4709e0a94429d, 2b0143b5c986be1ce8408b3aadc4709e0a94429d, 2b0143b5c986be1ce8408b3aadc4709e0a94429dunaffected
LinuxLinux4.1, 0, 5.10.163, 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.