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CVE Record

CVE-2023-53314: fbdev/ep93xx-fb: Do not assign to struct fb_info.dev

In the Linux kernel, the following vulnerability has been resolved: fbdev/ep93xx-fb: Do not assign to struct fb_info.dev Do not assing the Linux device to struct fb_info.dev. The call to register_framebuffer() initializes the field to the fbdev device. Drivers should not override its value. Fixes a bug where the driver incorrectly decreases the hardware device's reference counter and leaks the fbdev device. v2: * add Fixes tag (Dan)

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-53314 is a Linux kernel framebuffer driver bug that can cause availability impact. The issue is local, not network-exposed by itself, and requires low-privileged local access according to the CVSS vector. Business urgency is highest for embedded or specialty Linux systems using the EP93xx framebuffer driver.

Executive priority

Treat as a targeted availability maintenance item, not an emergency internet-wide exposure. Prioritize embedded or operational devices where local denial of service would disrupt service or recovery windows are limited.

Technical view

The ep93xx-fb driver incorrectly assigned the Linux hardware device to struct fb_info.dev. register_framebuffer() should initialize that field to the fbdev device. The bug can incorrectly decrement the hardware device reference counter and leak the fbdev device, producing a local availability risk.

Likely exposure

Exposure is likely limited to Linux systems carrying the affected ep93xx-fb framebuffer driver, especially embedded ARM environments. The source bundle does not identify affected distributions, appliances, or cloud images.

Exploitation context

No active exploitation is supported by the supplied sources, and the CVE is not listed as KEV. The CVSS vector indicates local access, low complexity, low privileges, no user interaction, and high availability impact.

Researcher notes

The available evidence describes a reference-counting/device lifetime bug in fbdev/ep93xx-fb. Sources do not provide exploit details, affected distributions, or standalone mitigations beyond the upstream stable fixes.

Mitigation direction

  • Apply a vendor kernel update containing the referenced stable fixes.
  • Check Linux distribution or embedded vendor advisories for backported fixes.
  • Prioritize systems where ep93xx-fb is present and framebuffer access is enabled.
  • Plan normal kernel-update reboot and rollback procedures.

Validation and detection

  • Inventory running kernel versions against the affected version data.
  • Check whether the ep93xx-fb driver is built, loaded, or required.
  • Confirm vendor kernel packages include one of the referenced stable fixes.
  • Run regression testing for display and boot behavior after updating.
Prepared
Confidence
high
Sources
10

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.

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CVE-2023-53314 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
3Timeline events
1ADP providers
9Source 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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2023-53314Attack 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

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
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62, 88017bda96a5fd568a982b01546c8fb1782dda62unaffected
LinuxLinux2.6.32, 0, 4.14.326, 4.19.295, 5.4.257, 5.10.195, 5.15.132, 6.1.54, 6.5.4, 6.6affected
Weakness

CWE details

No CWE listed

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