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CVE Record

CVE-2022-48829: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects the NFS server’s handling of very large file sizes in NFSv3 CREATE and SETATTR requests. The main business concern is unexpected file-size handling on systems serving NFSv3, not confirmed remote code execution or active exploitation.

Executive priority

Prioritize review for business-critical Linux NFS servers and affected vendor appliances. Without evidence of active exploitation or a severity score, this is best handled through controlled kernel patching and exposure reduction rather than emergency response.

Technical view

NFSD decoded NFSv3 size attributes into loff_t and previously capped oversized client values, risking corrupted or unexpected size semantics. Kernel stable commits remove that capping so oversized values can be handled consistently with NFSv3 error behavior expectations.

Likely exposure

Exposure is most likely on Linux systems running the kernel NFS server with NFSv3 enabled and reachable by clients. Systems not serving NFS, or not allowing NFSv3 access, are unlikely to be exposed based on the provided sources.

Exploitation context

The bundle does not show CISA KEV listing, public exploitation, exploit tooling, or CVSS scoring. Treat exploitation status as unconfirmed. The available evidence supports a protocol edge-case handling flaw in NFSD rather than a confirmed widespread attack path.

Researcher notes

Key review areas are fs/nfsd NFSv3 SETATTR and CREATE size decoding paths, especially handling values above signed 64-bit limits. Evidence is limited to CVE metadata, kernel stable commits, and vendor advisories; impact details remain incomplete.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable NFSD fixes.
  • Review vendor advisories, including Siemens notices, if using affected embedded or industrial products.
  • Restrict NFS service exposure to trusted networks and authenticated clients.
  • Disable NFSv3 where it is not required operationally.

Validation and detection

  • Inventory Linux hosts running kernel NFS server services.
  • Confirm whether NFSv3 is enabled and reachable from client networks.
  • Compare running kernel packages against vendor-fixed kernel advisories.
  • Check whether appliances map to the Siemens affected-product advisories.
Prepared
Confidence
medium
Sources
9

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

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CVE-2022-48829 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
3Timeline events
3ADP providers
8Source links

SSVC decision data

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

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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 5.4.295, 5.10.220, 5.15.24, 5.16.10, 5.17affected
Weakness

CWE details

No CWE listed

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