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CVE Record

CVE-2024-36958: NFSD: Fix nfsd4_encode_fattr4() crasher

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix nfsd4_encode_fattr4() crasher Ensure that args.acl is initialized early. It is used in an unconditional call to kfree() on the way out of nfsd4_encode_fattr4().

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A Linux NFS server flaw can crash affected kernels because cleanup may free an uninitialized ACL pointer. This can disrupt systems providing NFS services. The supplied evidence does not demonstrate data theft, data modification, or active exploitation, despite the 9.8 CVSS rating.

Executive priority

Treat exposed or business-critical NFS servers as urgent patching candidates because a kernel crash can interrupt shared storage and dependent operations. Rapidly inventory NFSD systems and obtain vendor-confirmed updates. Do not classify every Linux host as affected without package-level validation.

Technical view

In nfsd4_encode_fattr4(), args.acl was not initialized early enough. An error path unconditionally passes it to kfree(), potentially causing a kernel crash. Referenced Linux stable commits correct the initialization. The source bundle does not establish a practical impact beyond the documented crasher.

Likely exposure

Candidates are Linux systems running affected kernel builds with NFSD functionality in use, especially network-reachable NFS servers. The bundle's flattened version data is ambiguous, so affected status should not be decided from upstream version labels alone; confirm distribution or appliance package status.

Exploitation context

CISA KEV status is false, and no supplied source reports active exploitation. That does not prove exploitation is absent. The network CVSS vector indicates remote reachability, but the bundle provides no exploit prerequisites, observed attacks, or evidence supporting confidentiality and integrity impact.

Researcher notes

The documented defect is an uninitialized args.acl reaching unconditional kfree() during nfsd4_encode_fattr4() cleanup. Source evidence supports a crash condition, but not the CVSS confidentiality or integrity claims. Exact affected ranges and exploitability conditions remain insufficiently detailed in the supplied bundle.

Mitigation direction

  • Obtain exact fixed kernel package information from the relevant distribution or appliance vendor.
  • Install a vendor-supported update incorporating the applicable referenced Linux stable fix.
  • If no update is available, request a supported temporary mitigation from the vendor; none is named here.

Validation and detection

  • Inventory running kernel packages and identify systems providing NFSD services.
  • Compare each package build with the vendor's affected and fixed version guidance.
  • Confirm the deployed kernel includes an applicable referenced fix or vendor backport.
  • After updating, verify systems boot normally and required NFS services remain healthy.
Prepared
Confidence
medium
Sources
5

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-2024-36958 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
2ADP providers
4Source 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
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2024-36958Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux83ab8678ad0c6f27594c716cafe59c8bbd5e49ef, 83ab8678ad0c6f27594c716cafe59c8bbd5e49efunaffected
LinuxLinux6.7, 0, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

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