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CVE Record

CVE-2022-50767: fbdev: smscufx: Fix several use-after-free bugs

In the Linux kernel, the following vulnerability has been resolved: fbdev: smscufx: Fix several use-after-free bugs Several types of UAFs can occur when physically removing a USB device. Adds ufx_ops_destroy() function to .fb_destroy of fb_ops, and in this function, there is kref_put() that finally calls ufx_free(). This fix prevents multiple UAFs.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50767 is a Linux kernel flaw in the smscufx fbdev USB display driver. The bug can trigger use-after-free memory errors when a USB device is physically removed. Business urgency is mainly for systems where untrusted people can attach or remove USB display hardware.

Executive priority

Treat as a targeted local/physical-access kernel risk, not a broad remote emergency. Patch through normal kernel maintenance, with higher priority for kiosks, workstations, labs, and shared environments where USB access is difficult to control.

Technical view

The Linux kernel smscufx fbdev driver had several use-after-free conditions during physical USB device removal. The upstream fix adds ufx_ops_destroy() to fb_ops .fb_destroy and uses kref_put() to reach ufx_free(), preventing multiple UAF paths. No CVSS, CWE, or exploit details are provided in the source bundle.

Likely exposure

Exposure appears limited to Linux systems using or capable of loading the smscufx fbdev USB display driver, especially where physical USB access is available. Internet-facing exposure is not indicated by the sources.

Exploitation context

The CVE description ties the issue to physically removing a USB device. The source bundle does not report active exploitation, and CISA KEV status is false. No public exploit status is provided.

Researcher notes

Evidence is limited to the CVE record and kernel stable commits. Affected-version metadata in the bundle is not sufficiently clear to define exact vulnerable ranges. Validate against distro backports rather than relying only on upstream version numbers.

Mitigation direction

  • Apply Linux kernel or distribution updates containing the referenced stable fixes.
  • Prioritize systems with accessible USB ports and USB display use cases.
  • If no update is available, check vendor guidance for supported workarounds.
  • Restrict physical access to USB ports on sensitive Linux systems.

Validation and detection

  • Inventory Linux systems and kernel versions against vendor advisories.
  • Check whether the smscufx fbdev driver is present, built, or loaded.
  • Confirm vendor kernel packages include one of the referenced stable fixes.
  • Review physical access controls for systems with exposed USB ports.
Prepared
Confidence
medium
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.

ATT&CK lookup starting points

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CVE-2022-50767 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
0Timeline events
0ADP providers
9Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5, 3c8a63e22a0802fd56380f6ab305b419f18eb6f5unaffected
LinuxLinux3.2, 0, 4.9.332, 4.14.298, 4.19.264, 5.4.223, 5.10.153, 5.15.77, 6.0.7, 6.1affected
Weakness

CWE details

No CWE listed

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