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CVE Record

CVE-2022-48741: ovl: fix NULL pointer dereference in copy up warning

In the Linux kernel, the following vulnerability has been resolved: ovl: fix NULL pointer dereference in copy up warning This patch is fixing a NULL pointer dereference to get a recently introduced warning message working.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel OverlayFS defect that can cause a NULL pointer dereference in copy-up warning handling. The public record does not provide CVSS, CWE, or impact detail, so business urgency depends on whether affected kernel versions are in use.

Executive priority

Treat this as a normal kernel patch-management item unless local evidence shows crashes or affected high-value systems. Escalate priority for shared compute, container hosts, or environments with untrusted local workloads.

Technical view

The issue is in the kernel ovl code path for copy-up warning handling. The published description says the fix prevents a NULL pointer dereference introduced around a warning message. References point to Linux stable commits, but the source bundle does not describe privilege requirements, reachability, or complete impact.

Likely exposure

Exposure is limited to Linux systems running affected kernel builds. The bundle lists affected Linux versions including 5.16, 5.15.20, 5.16.6, and 5.17; one listed version value is ambiguous. Validate distribution backports rather than relying only on upstream version numbers.

Exploitation context

No source in the bundle reports active exploitation, and KEV is false. The available evidence supports a kernel reliability flaw, not confirmed public exploitation or weaponized use.

Researcher notes

The source record is sparse: no CVSS, CWE, exploitability, or detailed trigger conditions are provided. Do not infer remote exposure. Focus research on affected kernel branches, OverlayFS usage, and whether vendor kernels include the referenced commits.

Mitigation direction

  • Inventory Linux kernel versions across servers, containers hosts, and appliances.
  • Check vendor advisories for backported fixes for CVE-2022-48741.
  • Update affected kernels to builds containing the referenced stable fixes.
  • Prioritize systems using OverlayFS or untrusted local workloads.
  • Track Linux stable updates if vendor guidance is not yet available.

Validation and detection

  • Confirm whether deployed kernels match affected versions or vendor-fixed builds.
  • Review distribution changelogs for CVE-2022-48741 or referenced upstream commits.
  • Validate that patched kernels are running after maintenance windows.
  • Check operational logs for kernel NULL dereference events related to ovl.
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-2022-48741 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
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
4Source 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
LinuxLinux5cffa333a2b263821561328cc75a3ffc8097d093, 5b0a414d06c3ed2097e32ef7944a4abb644b89bd, 5b0a414d06c3ed2097e32ef7944a4abb644b89bd, 5.15.3unaffected
LinuxLinux5.16, 0, 5.15.20, 5.16.6, 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.