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CVE Record

CVE-2018-7755: An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel throu...

An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-7755 is a Linux kernel information disclosure in the floppy driver. A user able to reach the affected ioctl could obtain a kernel pointer, weakening defenses such as KASLR. It is not described as direct remote code execution.

Executive priority

Treat as a scheduled kernel security update with higher priority for shared Linux hosts. It weakens a major exploit mitigation but is not documented here as actively exploited or remotely reachable.

Technical view

The issue is in fd_locked_ioctl in drivers/block/floppy.c through Linux kernel 4.15.7. FDGETPRM can copy a kernel pointer into user memory, exposing kernel address information that may help bypass kernel address randomization.

Likely exposure

Exposure is most likely on Linux systems running affected kernel builds where user space can access the floppy driver ioctl path. The bundle names Linux kernel through 4.15.7 and includes Ubuntu, Debian, and Red Hat advisories, but no complete CPE list.

Exploitation context

The provided sources do not report active exploitation, and KEV is false. The vulnerability is useful as an information leak that can support later kernel exploitation by defeating address-hiding protections.

Researcher notes

Evidence is limited to the CVE description and vendor advisories. Validate reachability by reviewing affected kernel builds, distribution backports, and whether the floppy driver path is accessible in your environment. Do not assume all modern kernels are affected.

Mitigation direction

  • Apply the relevant kernel security update from your Linux distribution.
  • Prioritize Ubuntu, Debian, and Red Hat systems covered by the cited advisories.
  • Reboot systems into the updated kernel after patching.
  • If patching is delayed, check vendor guidance for supported temporary controls.

Validation and detection

  • Inventory running kernel versions and compare them with vendor advisory coverage.
  • Confirm CVE-2018-7755 is addressed in the installed kernel package changelog or advisory.
  • Verify systems have rebooted into the updated kernel, not only installed it.
  • Run vulnerability scanning again after patching and rebooting.
Prepared
Confidence
medium
Sources
11

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-2018-7755 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
14Source 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
n/an/an/aListed
Weakness

CWE details

No CWE listed

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