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CVE Record

CVE-2022-48668: smb3: fix temporary data corruption in collapse range

In the Linux kernel, the following vulnerability has been resolved: smb3: fix temporary data corruption in collapse range collapse range doesn't discard the affected cached region so can risk temporarily corrupting the file data. This fixes xfstest generic/031 I also decided to merge a minor cleanup to this into the same patch (avoiding rereading inode size repeatedly unnecessarily) to make it clearer.

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 can cause temporary file data corruption when SMB3 collapse-range handling leaves stale cached data in place. The sources describe a correctness and data-integrity problem, not confirmed code execution or privilege escalation.

Executive priority

Treat this as a data-integrity maintenance risk. Prioritize patching for systems handling important files over SMB3, but the provided evidence does not justify emergency response absent business-critical exposure.

Technical view

The SMB3 collapse range path failed to discard the affected cached region, risking temporary corruption of file data. The kernel fix invalidates or handles the cache correctly and resolves xfstest generic/031. Public sources provide no CVSS, CWE, or exploitation details.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel versions or commit ranges and using SMB3/CIFS file operations where collapse range is exercised. Systems not using this code path are less likely to see impact.

Exploitation context

The provided sources do not show active exploitation, and the CVE is not listed as KEV in the source bundle. Evidence supports a kernel data-corruption bug, but not weaponized exploitation.

Researcher notes

Key uncertainty is impact breadth: sources describe temporary data corruption and a regression-test fix, but provide no CVSS, CWE, exploitability analysis, or affected distribution matrix. Validate by kernel lineage and vendor backport status.

Mitigation direction

  • Apply Linux kernel or distribution updates containing the referenced stable fixes.
  • Check vendor kernel advisories for backported fixes before assuming version numbers are sufficient.
  • Prioritize hosts that mount or serve critical workflows over SMB3/CIFS.
  • Avoid manual kernel patch assumptions without confirming the exact vendor build includes the fix.

Validation and detection

  • Inventory Linux kernel versions and vendor build identifiers on exposed systems.
  • Confirm whether systems use SMB3/CIFS workloads that could exercise collapse range.
  • Verify the kernel includes stable commits 49523a473220 or fa30a81f255a.
  • Run relevant filesystem regression testing, including generic/031, in non-production where applicable.
Prepared
Confidence
medium
Sources
4

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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ATT&CK lookup starting points

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CVE-2022-48668 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
2ADP providers
3Source 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux5476b5dd82c8bb9d0dd426f96575ae656cede140, 5476b5dd82c8bb9d0dd426f96575ae656cede140unaffected
LinuxLinux5.13, 0, 5.19.12, 6.0affected
Weakness

CWE details

No CWE listed

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